Subscription ownership should not include permission to create custom owner roles. The principle of least privilege should be followed and only necessary privileges should be assigned instead of allowing full administrative access.
Perform the following in Azure Command Line Interface 2.0:
1. az role definition list
Check for entries with assignableScope of / or a subscription , and an action of *
Verify the usage and impact of removing the role identified
2. az role definition delete –name rolename