Issue Summary

Following a data residency migration to the Germany (DE) region, attachment previews in Confluence are failing to load.
Users see the error message "Something went wrong. We couldn't generate a preview for this file."

• This affects both existing attachments and new uploads.

Investigation shows a consistent JWT authentication failure when Confluence attempts to communicate with the Media/ Filestore service.

The error consistently points to:

{"error":{"code":"JwtAuthoriser:AuthenticationError","title":"Token verification failed: invalid signature","href":"https://dt-api-filestore.eu-central-1.prod.kitt-paas.net#UnauthorizedError"}}

Steps to Reproduce

• Access a Confluence instance recently migrated to the DE region.
• Attempt to view an existing attachment or upload a new image/ file to a page.
• Observe the preview failure.

Expected Results

Attachments should authenticate successfully with the Media API and generate previews regardless of the data residency region.

Actual Results

The Media API rejects the request with a 403 Forbidden due to an invalid JWT signature, preventing any media from being displayed or processed.

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available