I use Authy. However read past problems it may or may not of had. It is compatible with the Google Authentication algorithm with is a time based password system. I picked it over Google Authenticator ...

Follow these suggestions to fix the issue with the Microsoft Authenticator app for not displaying code. If the Microsoft account for the concerned user has expired or got deleted somehow, users can ...

My problem with taking the second option is that it's highly unlikely anyone will do the research needed to determine the true cause of a hack. CYA for the company rather than encouraging better ...