Managing personal Outlook.com account settings, security, and privacy
Hi there Embody C. I am Lumie and I would love to assist you today.
I understand your frustration. You should be able to add authentication systems for your friend here: [account.live.com/proofs/manage/additional].
You can then turn off Microsoft authenticator from here and keep it as just Two-Step verification using your other verification methods.
This is less safe, please keep this in mind.
DO NOT turn of Two-Step verification. It is necessary for a reasonable level of protection.
Here is more information on how to turn of Microsoft authenticator: [answers.microsoft.com/thread/79f809da-6b2d-4572-bcea-5cfd7efd1aae].
I hope this helps!
Let me know if I can be of any further assistance. -Lumie