Hi @Joe Dye
In this document, it provides the way for how to add the Mac addresses to Teams devices:
- Sign in to the Teams admin center.
- Expand Teams Devices.
- Select Provision new device from the Actions tab.
- In the Provision new devices window, you can either add the MAC address manually or upload a file.
Meanwhile, if you are provisioning Microsoft Teams Android Devices, you could also read this part Provisioning Process
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