Microsoft 365 Apps admin center devices are not checking in.

Question

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

manoth_msft · Answer

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?

changeonlyfridays · Answer

I have checked a couple devices. None of them have a TenantAssociationKey. Some devices have LastCheckInResult as 500 and one has 401.

manoth_msft · Answer

Are you positive that the devices are meeting the requirements as listed here: https://learn.microsoft.com/en-us/deployoffice/admincenter/inventory#requirements-for-using-inventory 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?

kidd_ip · Answer

ChangeOnlyFridays&nbsp;&nbsp;How about try another type of browser and InPrivtae mode?

matt_dobing · Answer

Sorry to drag up and old thread manoth_msft​.I have the exact same issue if you could potentially offer help...!Recently enabled cloud update. Have about 8 or so VMs (using device based licensing) that will not report in or show up in the inventory.On my VMs that do check in (also using device based) I can see many more keys under HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\C2RSvcMgrIncluding LastCheckInResult at 200.This is missing (along with other keys) on my non-reporting VMs.Also these VM's do not have a TenantAssociationKey, can I manually add it?Many thanks

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Microsoft 365 Apps admin center devices are not checking in.

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