Dear Rosemarie Alvarez, Â
Welcome to the community! Â
Before giving you the best solution, could you please confirm these questions below to help me diagnose the issue more effectively:Â
- May I please double confirm if the account in question is a Microsoft 365 educational account which is provided by your college/institution?
- What is your exact Microsoft 365 subscription name?
If you are using an education account, I would recommend that you contact your IT admin directly so that they may reset your MFA settings to your new mobile number.
Please understand that as a forum moderator, I don’t have access to the backend systems to troubleshoot this effectively due to privacy and security constraints. Since subscription and refund request things need action or approval from Billing team, so I strongly recommend the IT Admin should create a service request with Microsoft support to get advanced technical assistance and diagnostics. In this way, our dedicated billing support team will check your tenant and credit card information and assist you further. For reference: How to get a refund on a Microsoft subscription - Microsoft Support Â
I hope this information is helpful. If you have any difficulties or need further clarifications, feel free to reach out, and we can further investigate the problem together.  Â
If my answer is helpful, pleasemark it as an answer, which will definitely help others in the community who have similar queries to find solutions to their problems faster.
Thanks for your patience and understanding so far. Looking forward to hearing from you.    Â
Best Regards,     Â
Vivian - MSFT | Microsoft Community Support Specialist