@Edent in addition... there is currently no very good solution out there for the majority of people for transferring your active OTP codes between devices, or between OTP apps, or between the phone you dropped in the bath and the new one you've bought on ebay. I am v reluctant to even have non-technical users such as my parents switch from SMS auth (which they get) to an OTP app (which may not be backed up usefully), let alone to only use OTP so if you lose the code your account is unrecoverable