Hi @Andre Fernandez
Thank you for posting your query on Microsoft Q&A.
I understand that you have assigned Authentication Administrator and Privileged Authentication Administrator, but still service admins cannot access user's authentication methods section.
To Know the exact issue can you please provide more information about the issue you are facing along with screenshot.
As you have mentioned Global admin is a high level of permission, so you need not assign that role to service desk admins.
Privileged Authentication Administrator and Authentication Administrator is enough to access user's authentication methods section.
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Thanks,
B. Siri Chandana.