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 Organisation ID.
Enter the Reseller Number for the Apple Authorised Reseller or the authorised network provider 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 Organisation ID
An Organisation ID is your unique identifier in Apple Business Manager. When you give a participating Apple Authorised Reseller or an authorised network provider your Organisation ID (and you add that reseller’s Reseller Number to your account profile), you authorise that reseller to submit devices you purchased through them to Apple so their serial numbers appear in Apple Business Manager. The Organisation ID can also be used with app developers so they can distribute Custom Apps specific to your organisation.
Reseller Numbers
A Reseller Number is a unique identifier for each Apple Authorised Reseller or authorised network provider who participates in Apple Business Manager. When you add a participating Apple Authorised Reseller’s, or provider’s Reseller Number to your account profile (and you give that reseller your Organisation ID), you authorise that reseller or provider 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 Authorised Reseller or your authorised network provider, contact them for assistance.
After the Organisation ID and Reseller Numbers are exchanged and verified, you can arrange with your participating Apple Authorised Reseller or your authorised network provider 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 organisation 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 is not the same as your GSX account number.
Find your Organisation ID
After your organisation is approved for Apple Business Manager, you can find your Organisation ID. If you purchase devices from an Apple Authorised Reseller or an authorised network provider, you must provide your Organisation ID to them.
In Apple Business Manager
, sign in as a user that has the role of Administrator.Select your name at the bottom of the sidebar, select Preferences
, then select Organisation Information 
.Locate your Organisation ID.
Add an Apple Customer Number or a Reseller Number in the sidebar
You can add the Reseller Number of your participating Apple Authorised Reseller or your authorised network provider to your customer numbers list the first time you select the Device tab in the sidebar.
In Apple Business Manager
, sign in as 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 Authorised Reseller or your authorised network provider to your customer numbers list in Apple Business Manager Preferences.
In Apple Business Manager
, sign in as 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.