Are there any good ways of sharing 2 factor authentication credentials?
Scenario: I have probably 20 accounts secured by 2FA using (currently) Authy to manage them. A colleague similarly has their own 2FA setup (not sure what they use).
However there are some accounts we both need access to, and therefore at present we haven't enabled 2FA on. I want to set up 2FA in such a way that either of us can generate a code without sharing anything else to do it.
I believe this is using TOTP protocol? I don't know enough about how it works but I can't see any technical reason why the shared secret can't be shared between multiple people (Authy already lets me share between multiple devices, but in an "all or nothing" way.)
Obviously sharing 2FA credentials weakens security. But at present the alternative is not using it at all, and surely shared 2FA is better than that.