@SKakarla 

The "Unknown" owner problem appearing suddenly across multiple environments does suggest a Databricks-side change rather than something in your configuration.
This could be related to a recent update in how Databricks handles service principal authentication or displays ownership metadata. A few potential explanations:

1. There might have been a change in how Databricks resolves or displays SPN identities in the notebook metadata
2. Databricks could have modified permissions or identity handling for automated processes
3. There could be a new security update that's affecting how service principal information is displayed

Since the functionality is still working (you can still update and add notebooks), this appears to be primarily a display/metadata issue rather than an authentication problem.
To troubleshoot this, I'd recommend:

1. Checking if there are any recent Databricks platform updates or release notes that might explain this change
2. Opening a support ticket with Databricks to confirm if this is expected behavior from a recent update
3. Verifying if the actual notebook metadata (via API calls) still contains the SPN information even though the UI shows "Unknown"