Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Dear M.P.D. INTERCOMPASS LTD**,**
Good day! Thank you for reaching out to Microsoft community.
It sounds like Multi-Factor Authentication (MFA) was enabled for your account without your knowledge. This could be due to the reason of Automatic Security Defaults. Microsoft has been enabling security defaults for some tenants, which includes enabling MFA.
For your reference: Turn on MFA by using security defaults or Conditional Access - Microsoft 365 Business Premium | Microsoft Learn.
However, there is another specific channel for your mentioned concern where you will get some possible information for certain specific resources and platform from our related community members.
I understand your concern but since your problem is related to Multifactor authentication, I would also like to suggest you post your concern in the related community i.e., Ask a question - Microsoft Authenticator - Microsoft Q&A to get the detailed help from the experts.
Apologies for redirecting you to different community as the members in the category posted focus on the users with out of the box concerns on Microsoft 365 and have limited knowledge on the Microsoft Authenticator; so, to get the fast and better assistance, we have redirected you in the correct path.
Appreciate your patience and understanding. Have a great day!!
Best Regards,
S M Nazmun Nur