Getting back a Teams device that was manually removed in Teams admin center

I managed to solve the issue. Apparently the device had previously been signed into with another Teams room service account. This created a new device object that was still active even after switching account on the device. I believe that because the old device object was active, the TAC kept the device marked as removed.

By first logging out of the device, deleting both the old and new device objects in Endpoint Manager, and then logging back in, it reappeared in the list of devices in TAC after a few minutes.