ARM Template fails with "AuthorizationFailed"

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[Template Name goes here](Template link goes here)

### Issue Details

I can create MG from AZ portal with same user (which is Global Admin) but when I try to use ARM Template, I get following error:

{"code":"AuthorizationFailed","message":"The client 'xxxx@xxx.com' with object id 'a92b1c4a-921c-4009-bfbc-ddc3a9507c4b' **does not have authorization** to perform action 'Microsoft.Resources/deployments/validate/action' over scope '/providers/Microsoft.Resources/deployments/Microsoft.Template-20210322105058' or the scope is invalid. If access was recently granted, please refresh your credentials."}
### Repro steps (*if necessary, delete otherwise*)
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No template, file, or reproducible steps are provided. Start by identifying the ARM template and deployment context that trigger the Microsoft.Resources/deployments/validate/action authorization error, then compare the template deployment with the successful portal operation; done means the deployment validates successfully for the stated user and scope.

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