Cloud Shell VNet Isolation fails with VnetClientNotSupported after reset and reconfiguration

Hi,

I can create and use Azure Cloud Shell from the portal without any config. However when I try to assign it to a existing private network I get the below error. I've spent a lot of time with Copilot trying resolve this but no result yet.

Sorry, your Cloud Shell failed to provision: {"code":"VnetClientNotSupported","message":"Your Cloud Shell virtual network (VNet) isolation settings were configured with a newer version that this client does not support. Please open Cloud Shell from the Azure Portal to continue."} Please refresh the page. If the issue persists, please follow the troubleshooting guide Cloud Shell Troubleshooting or file a ticket New support request.

Note, despite the error message, it is being opened from the Azure Portal. Things I've done/observed

• Microsoft.PowerPlatform registered
• Microsoft.Relay registered
• relay namespace recreated
• subnet recreated and assigned as Microsoft.ContainerInstance/containerGroups
• storage account attached (fails with a storage account and without)
• Cloud Shell user settings reset (multiple times)

Any help would be appreciated.