After creating Machine Catalog and Delivery Group, VDAs would get deleted after turning them ON in Azure.

These happens to Windows 11 Single and Multi session VDAs

Error:

FailureMessage: Error starting machine. At least one resource deployment operation failed.

{"status":"Failed","error":{"code":"DeploymentFailed","target":"/subscriptions/...................","message":"At least one resource deployment operation failed. Please list deployment operations for details. Please see https://aka.ms/arm-deployment-operations for usage details.","details":[{"code":"LinkedAuthorizationFailed","message":"XXXXX'...................... with object id 'xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxx' has permission to perform action 'Microsoft.Insights/diagnosticSettings/write' on scope '/subscriptions/..................../resourcegroups/.............../Microsoft.Compute/virtualMachines/................./providers/Microsoft.Insights/diagnosticSettings/setbypolicy'; however, it does not have permission to perform action(s) 'Microsoft.OperationalInsights/workspaces/sharedKeys/action' on the linked scope(s) '/subscriptions/..................../resourcegroups/.................' (respectively) or the linked scope(s) are invalid."}]}}

Grant the service principal permissions to use the resource that's mentioned in the error message. 

Engage Azure Admin to assign the permission missing for SPN

Problem Cause

Insufficient permissions

https://learn.microsoft.com/en-us/troubleshoot/azure/azure-kubernetes/create-upgrade-delete/error-code-linkedauthorizationfailed