Q. Can I edit or add a sign-in Method in Microsoft?
Yes.
You can go to this link, sign in, and add or change existing sign in methods under Security Info.
https://mysignins.microsoft.com/security-info
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Set up your password reset verification method
Open the web browser on your device and go to the Security info page.
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Depending on how your administrator has set up your organization, one or more of the following options will be available for you to set up as your security verification method. If multiple options are available, we strongly recommend that you use more than one as your security verification method, in case one of your methods becomes unavailable.
After you select and set up your methods, choose Finish to complete the process.