Hi,
Thank you for posting in Microsoft Q&A forum.
Per my experience, one SCCM primary site connecting to multiple tenants is not supported. I have gone through the official articles and found there may be a workaround for your situation: CMG with Azure AD discovery supports multiple tenants.
If you're using Azure AD authentication for the users and devices managed over the CMG, onboard that Azure AD tenant. When you onboard each Azure AD tenant, a single CMG can provide Azure AD authentication for multiple tenants, regardless of the hosting location.
For more information, please refer to:
Is Co-management supported with different AADs
Frequently asked questions about the CMG
Thanks for your time. Have a nice day!
Best regards,
Simon
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