@Chris Briand Thank you for reaching out to us, As I understand you are getting message stating "error: policy is missing" in the portal after you ran the scan job.
There's no a single reason or cause for this error, indeed, the reasons this issue may happen for many reasons such as:
- Missing the correct licensing.
- Missing AIP Service Principal API permissions.
- Network/SSL errors.
- Policies are not defined in SCC.
- Policy missing the AIP Scanner Service Principal as a member.
- AIP Scanner Service is disabled or not started.
- The scanner is unable to find your Microsoft Information Protection (MIP) policy file that should be under: %localappdata%\Microsoft\MSIP\mip\MSIP.Scanner.exe\mip\mip.policies.sqlite3
If all pre-reqs are in place, I would recommend to check with network part, make sure all required urls are allowed on the firewall - https://learn.microsoft.com/en-us/purview/deploy-scanner-prereqs?view=o365-worldwide#windows-server-requirements:~:text=%2D%20Network%20connectivity
Let me know if the above information helps to isolate this issue or not, feel free to post back.