Set up the Microsoft Authenticator app as your verification method

https://support.microsoft.com/en-gb/account-billing/set-up-the-microsoft-authenticator-app-as-your-verification-method-33452159-6af9-438f-8f82-63ce94cf3d29

Set up SMS sign-in as a phone verification method

https://support.microsoft.com/en-gb/account-billing/set-up-sms-sign-in-as-a-phone-verification-method-0aa5b3b3-a716-4ff2-b0d6-31d2bcfbac42