Use a different Microsoft Halo account?

I bought the Halo game for the PC, after which I have to log in with my Xbox Live account. I did this, but my account was blocked because no phone number is stored. To unlock I gave my details, unfortunately I did not get a code via SMS, now I can only try again in 24 hours, but this annoys me because I did not do anything wrong. I would like to use another account of mine, but there's no way to change accounts in the game Start.

Is there a way to reset the game? Remove the account to externally in the game files or somehow?

I'm not familiar with Halo, but knowing Microsoft doesn't work. You should contact Microsoft support. Maybe she could help you.