We've identified an issue with the Notebook Preview feature returning an error. When clicking on an existing Notebook, the following error message is returned:
Forbidden. You don't have access to this resource.
We've found that the issue is intermittent on affected notebooks, and not all Workspaces are affected. Affected notebooks can still be edited and ran as normal.
Our engineering teams are currently working to resolve the issue, we'll post on this page with updates as we have them.