Microsoft 365 Apps admin center devices are not checking in.

Copper Contributor

None of our devices have checked in since August 2nd. I see no obvious blocks in our FWs or AV systems.

4 Replies
Two quick thinks to check on an affected device:

Is the TAK (token to connect) set: HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\cloud\office\16.0\Common\officesvcmanager > TenantAssociationKey

Check the value of HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\C2RSvcMgr > LastCheckInResult. Is it 200 (successful check-in) or a different value?
I have checked a couple devices. None of them have a TenantAssociationKey. Some devices have LastCheckInResult as 500 and one has 401.
Are you positive that the devices are meeting the requirements as listed here: as well as that users are signing in with an AzureAD account from your tenant and have launched the Microsoft 365 Apps at least once?



How about try another type of browser and InPrivtae mode?