Using Outlook for iOS for personal email and calendar management
As suggested, use the Sign-In Helper to see if you can recover your account.
But if all else fails and you can complete one verification step for your account (e.g. password), but can't access any of the other verification methods, and have repeatedly failed the Account Recovery process, or can't use Account Recovery because your account has Two-step Verification (2FA, MFA), then you can try to request that all the verification methods be replaced.
This will put your account in a 30 day "Pending Request" state. You will have limited access to the account during this period or no access at all if the account has Two-step Verification enabled.
See the Answer by "Hornblower409 Jun 25 2026" in
https://learn.microsoft.com/en-us/answers/questions/5920985/how-to-fix-we-will-send-a-verification-code-to-(mo