O365: Enable Inventory of Devices on Config.Office.com

First confirm the devices meet the following requirements:

Microsoft 365 Apps for enterprise or Microsoft 365 Apps for business, Version 2008 or later
A version of Windows 10 supported by Microsoft 365 Apps for enterprise or Microsoft 365 Apps for business
Microsoft 365 (or Office 365) for Business Standard, Business Premium, A3, A5, E3, or E5 subscription plan

Client devices must be able to reach the following endpoints:
https://login.live.com
https://config.office.com
https://config.office.net

If the requirements look good, you can manually stamp the TAK in the registry using the following steps:

 

Navigate to Settings https://config.office.com/officeSettings/settings

Copy your current TAK from the Apps Admin Center portal (Settings).


Create a new REG_SZ registry value titled “TenantAssociationKey” in the following location: HKLM:\SOFTWARE\Policies\Microsoft\office\16.0\Common\officesvcmanager
Add your TAK to this value.

  • Open a terminal window and run the following command:

C:\Program Files\Common Files\microsoft shared\ClickToRun\officesvcmgr.exe” /checkin

If there are no additional blockers, you should see the device appear in Inventory in about 5 minutes.

Here is a proactive remediation care of Anthony Fontanez.
https://anthonyfontanez.com/
https://github.com/ajf8729/Toolbox/tree/main/Intune/PR/M365TenantAssociationKey

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