I understand how frustrating it is when the verification keeps going to a landline that can’t receive text codes.
Have you already tried the Q&A Assist suggestions? In addition, could you please confirm a few details:
- What verification options are currently shown when you try to update your phone number? Is it only the landline, or do you see an option like an email or Authenticator app?
- Are you able to sign in normally to your Microsoft account, or are you being blocked at the verification step
- When updating your info, do you see a “Try another way to verify” option?
- Have you previously added any alternate security info (such as a backup email or another phone number)?
Looking forward to your update so I can assist you further. Thanks for your patience and understanding.