When you purchase iOS devices, the reseller sends information to Apple and the devices will appear in the Apple Business Manager.

The default MDM server can be set for a specific type of device. All activated devices will be assigned to the specified MDM server.

How to Set Default MDM Server

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Open Apple Business Manager
Navigate to Settings and select Device Management Settings
In the Default Device Assignment, click on the drop-down menu and select the default MDM server for each device
Click Apply and Done

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