Communicate to the customer that this means the query has been blocked by the company query blacklisting controls and they should talk to their IT Admin.
Have you changed your projects permissions recently?
to generate a report of changes relative to an existing service configuration version
Have you changed the secrets to your Connector Handlers and the Identity & Permissions Store
Check to see if you recently rotated the credentials of the service accounts set up for Glean in the SaaS applications and forgot the update Glean with the new credentials
solution:
manually regenerate the secrets, replace the secrets with the new ones, and see if things are fixed then.