A Configuration Item or Configuration Baseline import fails with the error message The CI contains a missing or invalid CI reference.
Cause: The problem is most likely that the Baseline was exported from a higher ConfigMgr version and that it contains elements that are missing in the release that it is imported to. Example: The supported platforms may contain a new OS version. The result will look like this:
If you exported the sources yourself it’s probably easiest to modify the CIs. If not this link may be helpful: https://www.1e.com/news-insights/blogs/how-to-fix-a-compliance-baseline-that-will-not-import-successfully/