I'm experiencing an unusual issue following my return from annual leave. I'm unable to connect to any compute from a notebook (both Classic Compute and Serverless) this is despite having Can Manage permissions on the clusters.

The error shown is: "Unknown cluster: Insufficient cluster permissions or cluster doesn't exist anymore"

Notably I can still do all of the following without issue:

• Browse and preview data in Unity Catalog
• Run queries in the SQL Editor against our SQL Warehouse
• Create, manage, and start clusters

Steps already taken with no resolution:

• Full laptop reboot
• Named access with Can Manage granted on a specific cluster
• Checked browser/session is not stale by logging out of Databricks and back in

We are on Azure Databricks. Has anyone seen this pattern before where SQL Warehouse and Unity Catalog browsing work fine but notebook compute attachment is broken for a specific user?
The cluster does start when I choose it and shows the green dot but then looks like the attached screenshot and the only option given is to detach.