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Dear Julia Santilli,
Good day! Thank you for posting to Microsoft Community.
I read your thread and get some background information of your scenario. To better understand and investigate your issue, I may need some more detailed information from your side so that I can narrow down the issue in the right way:
- Could you please confirm if you're using your Microsoft 365 Business/Education email account, personal Microsoft account such as Outlook.com, hotmail.com, or live.com, or another third-party/custom domain email account to send the email?
- Kindly confirm if you have an issue with Microsoft authenticator app? Please describe your issue more so that I can narrow down the issue. Is it account set up issue, or the issue is related with MFA code that you are not receiving in your app for authentication? Thank you.
Initially, I asked for some information as I couldn't find the some above requested n in your case description so that we can understand some more specific scenario for your current situation. If you share the information requested above, it will help us for additional inquiries.
I look forward to your next update in private message for further analysis. Thank you very much for your cooperation. Have a nice day!
Sincerely,
Nafis Iqbal Shuvo