Manage device suppliers in Apple Business Manager
You can have your devices added to Apple Business Manager at the time of purchase. To do so, you must:
Share your Organization ID.
Enter the Reseller Number for the Apple Authorized Reseller or the authorized cellular carrier you purchase from.
Enter an Apple Customer Number if you are purchasing from Apple.
There are two ways you can add Reseller Numbers and Apple Customer Numbers:
The first time you select Devices in the sidebar
In Preferences > MDM Server Assignment
Your Organization ID
An Organization ID is your unique identifier in Apple Business Manager. When you give a participating Apple Authorized Reseller or an authorized cellular carrier your Organization ID (and you add that reseller’s Reseller Number to your account profile), you authorize that reseller to submit devices you purchased through them to Apple so their serial numbers appear in Apple Business Manager. The Organization ID can also be used with app developers so they can distribute Custom Apps specific to your organization.
Reseller Numbers
A Reseller Number is a unique identifier for each Apple Authorized Reseller or authorized cellular carrier who participates in Apple Business Manager. When you add a participating Apple Authorized Reseller’s, or carrier’s Reseller Number to your account profile (and you give that reseller your Organization ID), you authorize that reseller or carrier to submit devices you purchased through them to Apple so their serial numbers appear in Apple Business Manager.
If you don’t know the Reseller Number of your participating Apple Authorized Reseller or your authorized cellular carrier, contact them for assistance.
After the Organization ID and Reseller Numbers are exchanged and verified, you can arrange with your participating Apple Authorized Reseller or your authorized cellular carrier to have them submit your orders through their portal to Apple (it won’t happen automatically).
Apple Customer Numbers
The Apple Customer Number is the account number (or numbers) assigned to your organization by Apple, used to purchase Apple hardware or software. If you don’t know the numbers, contact your purchasing agent, finance department, or Apple account team. This number isn’t the same as your GSX account number.
Find your Organization ID
After your organization is approved for Apple Business Manager, you can find your Organization ID. If you purchase devices from an Apple Authorized Reseller or an authorized cellular carrier, you must provide your Organization ID to them.
In Apple Business Manager
, sign in with a user that has the role of Administrator.Select your name at the bottom of the sidebar, select Preferences
, then select Organization Information 
.Locate your Organization ID.
Add an Apple Customer Number or a Reseller Number in the sidebar
You can add the Reseller Number of your participating Apple Authorized Reseller or your authorized cellular carrier to your customer numbers list the first time you select the Device tab in the sidebar.
In Apple Business Manager
, sign in with a user that has the role of Administrator.Select Devices
in the sidebar, enter the Apple Customer Number or Reseller Number, then select Add.You can add more than one Apple Customer Number or Reseller Number.
Note: When entering your Apple Customer Numbers, omit any leading zeros.
Add an Apple Customer Number or a Reseller Number in Preferences
You can add the Reseller Number of your participating Apple Authorized Reseller or your authorized cellular carrier to your customer numbers list in Apple Business Manager Preferences.
In Apple Business Manager
, sign in with a user that has the role of Administrator.Select your name at the bottom of the sidebar, select Preferences
, then select MDM Server Assignment 
.Select Edit next to Customer Numbers, enter your Apple Customer Numbers or Reseller Numbers, then select Done.
If the Add button is missing or dimmed, this information may already be saved.
Note: When entering your Apple Customer Numbers, omit any leading zeros.