SOLVED: How To Enable A Device After A User Disables It In M365

On the weekend we had a customer who was trying to remove one of their Microsoft Office 365 activations (which we have instructions for here), but instead they deactivating their laptop completely:

They user disabled their computer by:

1. Signing into https://portal.office.com
2. Clicking their icon in the top right corner and selecting VIEW ACCOUNT
3. Clicking DEVICES
4. Expanding the DEVICE in question, in this case, their laptop
5. Clicking the DISABLE THIS DEVICE

To undo this mistake and administrator needs to reenable the device by:

1. Logging into https://portal.azure.com
2. Going to MICROSOFT ENTRA ID
3. Expanding MANAGE and clicking DEVICES
4. Type in the host name of the computer and click on the one you want
5. Click the ENABLE button

In this screenshot, you can see the ENABLE button is grayed out because this device was already enabled.

CLICK TO EXPAND GRAPHIC

Hopefully that makes sense to you.