Hello @John Aherne,
Thanks for reaching on this forum.
Indeed this issue is frustrating, Couple of things to consider to troubleshoot :
Is there any IP Address change while you're using Databricks. You can use a site like whatismyip.com to see your current IP address. If it's changing over time or when you open a new browser tab, that could be why you're getting the error.
We can also check of VPN connectivity: Some VPNs can cause your IP address to appear differently to Databricks, which could cause the error.
You may want to disable Browser extensions, or You could try connecting from a different network and see if the problem persists.
You can check the status of Azure services and regions on the Azure status page. please let us know and we can help you further.