This has happened a few times where people have joined the Microsoft Teams Room (MTR) to the domain and some policies have been applied. One of the things that is sometimes removed from the MTR is that the Auto Logon feature can be removed. The result of this is that the MTR app won’t auto start and load up when the device is rebooted.
To re-enable this, simply edit the registry entry as per below on the Microsoft Teams Room. It might have saved the settings, you may just have to change AutoAdminLogon to 1.
HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon AutoAdminLogon = (REG_SZ) 1
Official documentation on this is detailed on the Microsoft site.