Building and customizing solutions using Microsoft 365 Copilot APIs and tools
Dear @David Stewart,
Thank you for posting your question in the Microsoft Q&A forum.
We apologize for any inconvenience you may encounter when using our services/ products. Based on your description:
If your GCC High tenant has Copilot and the Enhanced personalization control is available/ON, then personalization is technically supported under admin governance as described in Microsoft documentation.
If your compliance posture treats “remembering user preferences/history” as sensitive, you can disable Enhanced personalization tenant-wide.
Here is a reference: Microsoft 365 Copilot is now available in GCC-High | Microsoft Community Hub