How to distribute custom app using Apple Business manager?
Usually you do this by going into &quot;Device Management Settings&quot; and entering your Apple Customer Number as well as your reseller's ABM/DEP IDs. This means that when you purchase new devices from this reseller, they're automatically added to ABM.
You can read Apple's guide on this here.
If you want to manually add a few devices to test with, you can do that too:
Install &quot;Apple Configurator 2&quot; from the App Store on a Mac. Connect the device to the Mac. You'll automatically be prompted on whether to enroll this device. When you have done so, it will appear in ABM under Devices and then &quot;Devices added by Apple Configurator 2&quot;. You can assign it to a MDM server.
You can read Apple's guide on this here.
Remember that you need to have an MDM solution in advance.