I've always had MFA enabled since we got the option to have it and I've never had any problems since we got access to MFA, but all last week I had constant problems since neither the SL website nor any of the SL viewers would accept my authentication app tokens... I reinstalled several times, cleared cache everywhere, changed authenticator apps several times, tried other web browsers... and nothing worked on the web or the viewer, in the end I had to remove that option from my account... and I haven't tried again because I got fed up with not being able to work in peace.
It would be great to have an authentication system or more security options that are really reliable
I don't currently trust Second Life's MFA, but I also don't like having my account with just a password and nothing else.