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ChangeOnlyFridays's avatar
ChangeOnlyFridays
Copper Contributor
Aug 22, 2023

Microsoft 365 Apps admin center devices are not checking in.

None of our devices have checked in since August 2nd. I see no obvious blocks in our FWs or AV systems.
microsoft 365 apps for enterprise
ChangeOnlyFridays's avatar
ChangeOnlyFridays
Copper Contributor
Aug 24, 2023
I have checked a couple devices. None of them have a TenantAssociationKey. Some devices have LastCheckInResult as 500 and one has 401.
  • Matt_Dobing's avatar
    Matt_Dobing
    Copper Contributor
    Feb 18, 2026

    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\C2RSvcMgr

    Including 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

    • BobClements's avatar
      BobClements
      Icon for Microsoft rankMicrosoft
      Feb 23, 2026

      Hi Matt_Dobing​, 

      The onboarding flow for inventory requires user sign-in of the Office apps. In the case of device-based licensing, that action doesn't occur. 

      Give these steps a try:

      1. Copy the TAK from the Setup page at config.office.com.
      2. Create the following REG_SZ value and add your TAK: HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\cloud\office\16.0\Common\officesvcmanager ! TenantAssociationKey
      3. Trigger a check-in: 'C:\Program Files\Common Files\microsoft shared\ClickToRun\officesvcmgr.exe' /checkin
      4. Give the service a few minutes and see if your device shows up.