astly, the option of using SMS codes from the user's mobile phone provides a widely accessible method for two-factor authentication, especially for users who may not have access to the other two methods at all times.

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https://uct.microsoftcrmportals.com/forums/general-discussion/7b546c96-6ff2-ee11-a81c-000d3ab7475d
https://uct.microsoftcrmportals.com/forums/general-discussion/666ef8fb-6ff2-ee11-a81c-000d3ab7475d
https://uct.microsoftcrmportals.com/forums/general-discussion/ff97bc6a-70f2-ee11-a81c-000d3ab7475d