Hi Tom Bergman,
Thank you for reaching out to us on Microsoft Q&A forum.
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Based on your error we understand you are facing the issue with deployment validation failed.
Error: Code=AuthorizationFailed; Message=The client 'live.com#******@gmail.com' with object id '8b9f0450-da96-4bf9-8d09-a4cd2b9b21d9' does not have authorization to perform action 'Microsoft.Resources/deployments/validate/action' over scope '/subscriptions/376677b8-4f72-4242-8bba1d176656158f/resourcegroups/Training/providers/Microsoft.Resources/deployments/blanktemplate' or the scope is invalid.
To troubleshoot your error message, can you make sure that the client(ID) that you're using has the correct RBAC role or Microsoft.Resources/deployments/validate/action permission, over the / subscriptions/376677b8-4f72-4242-8bba1d176656158f /resourcegroups/Training/providers/Microsoft.Resources/deployments/blanktemplate' scope?
For more info: https://learn.microsoft.com/en-us/azure/role-based-access-control/role-assignments-portal?tabs=delegate-condition
We hope this information is helpful. If you require further assistance, please don't hesitate to reach out to us and kindly provide the screen shots for further reference.
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Thank you.