It gates zero-touch deployment
Automated Device Enrollment, MDM server assignment, and Blueprints all read the Devices list. No serials in the list, no zero-touch. Every downstream automation waits on this step.
Apple Business setup
How to add reseller and Apple Customer Numbers to Apple Business
You bought twenty-five MacBook Airs, the tracking numbers say they’ve shipped, and the Devices pane in Apple Business is still empty. Nine times out of ten the fix is a single missing setting: either your Apple Customer Number or your reseller’s DEP Reseller Number isn’t linked to the tenant. This is the handshake, the click path, and every reason it quietly fails.
In this guide
- Why new Apple purchases don’t appear on their own
- Apple Customer Number vs. Reseller Number
- The two-way handshake with Apple and your reseller
- Where to find each number (and who to ask)
- Click path in Apple Business — verified April 2026
- How long propagation takes
- Common pitfalls and how to fix them
- Devices ordered before the link was added
Context
Why this is the step everything else waits on
Apple Business (formerly Apple Business Manager) only receives a serial number when two conditions are true at once. The reseller has your Organization ID on their side, and their Reseller Number is listed on your Apple Business account. If either half is missing, Apple sees the purchase but has no instruction to route the serials to your tenant — so Devices stays empty.
It’s the #1 support-community post
“Why aren’t my new MacBooks showing up in Apple Business?” is the single most common thread on Apple Support Communities and Jamf Nation from new admins. It is almost always a missing reseller link.
It’s quiet and easy to miss
Apple Business doesn’t warn you that the handshake is incomplete until a reseller tries to submit serials against your org and the submission bounces. The first signal most admins see is a late email from Apple, not a dashboard alert.
It propagates over hours, not minutes
New handshakes take 24 to 72 hours to fully activate on Apple’s side. Do this step at least 48 hours before the first shipment hits the dock, not the morning of deployment.
The two numbers
Apple Customer Number vs. Reseller Number
Two different identifiers, same field in Apple Business. Both go in the Customer Numbers list under Preferences. You’ll usually have one Apple Customer Number and one or more Reseller Numbers — add every channel you buy through.
Apple Customer Number
Issued by Apple when your org buys directly — apple.com/retail/business, your Apple account team, or an Apple Retail Business Team. Prints on every Apple invoice and sales order. Not the same as your GSX number. Strip leading zeros before typing; Apple’s form silently mis-validates them.
Reseller Number (DEP Reseller ID)
Issued by Apple to each Apple Authorized Reseller or authorized cellular carrier. Unique per reseller — CDW has one, Insight has one, AT&T has one. You can’t look it up yourself; the reseller’s account manager has to give it to you.
Not eligible
Amazon, eBay, most consumer retail, and refurbished or grey-market channels can’t submit serials to Apple at all. Devices from those channels go through Apple Configurator instead — see the walkthrough linked at the bottom.
Multiple of either
Big orgs often have several Apple Customer Numbers across business units or subsidiaries, plus three or four reseller relationships. Add every one. Apple Business will not deduce a parent account from a child and missing any channel means those devices simply don’t appear.
The handshake
It’s a two-way exchange, not a one-way add
The single concept that unsticks most failed setups. Adding the reseller’s number to your tenant is only one half. The reseller also has to add your Organization ID to their ordering system. Both sides have to be true before Apple’s routing works.
You → Reseller
Send them your Organization ID (sometimes called DEP Customer ID). It lives in Preferences under Enrollment Information in Apple Business. Copy it as-is; no formatting changes.
Reseller → You
They send you their Reseller Number. You paste it into the Customer Numbers list in Apple Business Preferences. This is the half most admins know about; the first half is the one that gets forgotten.
Apple meets in the middle
With both sides registered, when the reseller submits serials to Apple they include your Organization ID. Apple checks that your tenant lists their Reseller Number, confirms the match, and routes the serials into your Devices list.
Where to find the numbers
Who has what, and who to ask
Most admins don’t have either number handy on day one. The lookup is easy once you know who to ask.
Apple Customer Number
Try purchasing or procurement first — it’s printed on every Apple invoice and quote PDF. Finance/AP will have it on file. Your Apple Business account team can look it up by domain. If you bought through apple.com/shop under a business account, it’s in your order history.
Major U.S. resellers
CDW, Insight, Connection (PC Connection / GovConnection), Zones, CompuCom, WEI, iT1, BITS, Gravity Systems, The Foundation, Vox Mobile — all listed in Apple’s Preferred Device Enrollment Resellers guide. Go through your account manager; there’s no self-service form.
Cellular carriers
AT&T Business, Verizon Wireless Enterprise, and T-Mobile for Business all have fleet/enterprise desks that handle DEP. Not the retail store — the business account team. Ask for the DEP Reseller Number for your account.
Best Buy Business
Via the Best Buy for Business rep assigned to your account. Walk-in purchases at a consumer Best Buy won’t work — the DEP submission only happens on business-channel orders.
Apple Retail walk-ins
Don’t auto-appear unless the sale was processed by an Apple Retail Business Team with your Apple Customer Number attached at the register. A regular retail receipt won’t route into Apple Business.
Your Organization ID
The value you hand to the reseller. Preferences → Enrollment Information in Apple Business. Send it in the same email where you ask for their Reseller Number — saves a round trip.
Click path
Adding the number in Apple Business
Verified against the live Apple Business UI as of April 2026. The primary path is Preferences; the Devices pane offers a shortcut empty-state prompt if the tenant has no numbers yet.
Step 1 — Sign in as Administrator
Go to business.apple.com and sign in with a Managed Apple Account that holds the Administrator role. People Manager and Device Enrollment Manager roles see the field but cannot save changes.
Step 2 — Open Preferences
Click your name at the very bottom of the left sidebar and choose Preferences. This is the area that got reorganized in the March 2025 update; older screenshots floating around the internet look slightly different but the labels below are current.
Step 3 — Find the section
Scroll to Device Management Service Assignment (under “Your Device Management Services”). Click Edit next to Customer Numbers.
Step 4 — Enter the number
Type the Apple Customer Number or Reseller Number into the field. No leading zeros on Apple Customer Numbers — Apple’s validator rejects or silently mis-matches them. Reseller Numbers go in exactly as provided.
Step 5 — Add, repeat, done
Click Add. Apple validates the number server-side immediately; known-good numbers appear in the list instantly. Repeat for every additional number, then click Done.
Shortcut — Devices pane empty state
If your tenant has no numbers yet, opening Devices displays a built-in prompt to enter an Apple Customer Number or Reseller Number. Same underlying field, fewer clicks on first setup.
After you add it
Propagation and verification
Adding the number is the moment of truth, but the validation you see in Apple Business is only half the check. The other half is whether the reseller has actually attached your Organization ID on their side.
Instant vs. 24–72 hours
A known, correctly formatted number validates instantly and appears in the list right away. But the full reseller handshake — the part that lets real serial numbers start flowing — can take 24 to 72 hours to propagate across Apple’s infrastructure.
The “add them as a reseller” email
If the reseller submits serials before your handshake has fully activated, the Apple Business admin gets an email that reads roughly: “The devices submitted by [reseller] on your behalf on [date] will not be available for enrollment in Apple Business Manager until you add them as a reseller.” That message is the definitive tell that the reseller did their half but yours didn’t land in time.
Confirming in Devices
New purchases appear in Devices within a few hours of order shipment — sometimes same-day, sometimes next business day, following the reseller’s batch submission cadence. The Source column shows which Customer Number or Reseller Number the serial came in on. Filter by Source to isolate a single channel’s feed.
The order-messages log
View reseller and carrier device order messages in the sidebar logs every batch submission and every rejection. Your source of truth when reconciling “did CDW actually submit these yet?” against a PO.
When it breaks
Common pitfalls and fixes
In rough order of frequency, the things that go wrong with this step and how to resolve each one.
Reseller forgot your Organization ID
You added their number, waited three days, and nothing showed up. Email them your Organization ID from Preferences → Enrollment Information and ask them to confirm they’ve attached it on their ordering side. This is the single most common root cause.
Devices ordered before the link existed
Orders placed before you added the reseller number don’t appear retroactively on their own. Ask the reseller to resubmit those serials against your Organization ID. CDW, Insight, and Connection handle this readily; smaller resellers sometimes need a ticket opened.
Leading zeros on the Apple Customer Number
Apple’s form either rejects outright or silently mis-validates. Strip every leading zero; the rest of the digits go in as-is.
Wrong role in Apple Business
Only Administrators can save this field. Device Enrollment Managers and Content Managers see the Edit button but changes don’t stick. If edits keep vanishing, check the role.
Non-authorized channel
Amazon, eBay, consumer retail, and used/refurbished channels can never be added this way. They don’t submit serials to Apple’s DEP pipeline at all. Those devices go through Apple Configurator — link below.
Apple Retail consumer purchase
A standard retail receipt won’t route into Apple Business. Sales have to go through an Apple Retail Business Team with your Apple Customer Number attached at the register to auto-enroll.
Want this handled for you?
Arclion handles reseller onboarding as part of Foundation
Getting CDW, Insight, Verizon, or an Apple account team to actually complete their half of the handshake is one of those tasks that burns a week if you’ve never done it and takes an hour if you have. Arclion’s Foundation engagement covers Apple Business setup, reseller linkage, default MDM assignment, and the baseline device standards a small business actually needs. Ongoing management is flat per-device.
What to send
- Which resellers or carriers you buy Apple through
- Whether Apple Business is already set up
- Approximate annual device volume
Keep reading
Related Arclion resources
How to set up Apple Business
The end-to-end setup walkthrough for Apple Business itself — verification, MDM selection, admin roles — the step most orgs complete before linking a reseller.
Read the guideAdd devices with Apple Configurator
The manual path for retail, BYOD, and second-hand devices that came in through channels a reseller number can’t cover.
Read the walkthroughApple Business & MDM Guide
A deeper explainer on how Apple Business and an MDM fit together, and why most small businesses still benefit from a dedicated MDM even with the built-in option.
Read the guide