Hi,
To change the phone number associated with your Microsoft account, please follow these steps:
- Go to the Microsoft account security page: https://account.microsoft.com/security/
- Sign in with your Microsoft account credentials.
- Click on "Update info" under the "Security info" section.
- Click on "Add a new phone number" and follow the prompts to add your new phone number.
- Once you have added your new phone number, you can set it as the default for receiving security codes by clicking on "Set as default" next to the phone number.
After you have updated your phone number, you should be able to receive security codes to your new phone number when logging in to your Microsoft account.