Allow Guest users to change their MFA
Guest (B2B) users should be able to reset/change their MFA options. Currently when a guest user gets a new phone, they have no way to fix the Authenticator app. Currently Guest can only try and find a contact at the tenant org and have them reach out to IT in order to reset. This is very confusing for all users.
Wey, Stefan commented
Is this Feature in Legacy My Apps still available, I can not find it.
(No, I could not find it)
https://myaccount.microsoft.com/?ref=MeControl&login_hint=[user%40contoso.com]&tid=[guest tenant id]
(It can be strange because you can not see the company and the branding will always be from the home tenant)
This is possible under the legacy My Apps experience but looks to have been removed in the new experience. Under the legacy experience you can switch to the guest organization then select 'Profile' then 'Additional security verification'. For now this is still possible if you first select 'Leave the new experience' then 'Dismiss' the updated experience banner.