Discovered this excellent write up from 2019 explaining why MS Authenticator didn't work for TOTP with _one_ of our in-house systems.

Blindly accepts QR codes for configurations it DOESN'T EVEN SUPPORT. Still, 3 1/2 years later.

https://labanskoller.se/blog/2019/07/11/many-common-mobile-authenticator-apps-accept-qr-codes-for-modes-they-dont-support/

#mfa #doItRight #errorMessagesAreUseful