Why does the generated OTP not work?

The most common reason why this doesn't work is because time is off. Even if the minutes match on your phone and computer - it may be seconds off. This will affect the time based OTP generation.

Do a time sync and try again. If you are in a virtual machine - update the hosts time because sometimes VM integration tools sync time from the host to the guests.

==========================

Comment by larry.ellis

There is more to it than this. There are bugs in the .Net date library that can cause the Unix timestamp to be incorrect. I believe this has to do with DST time (in my case, the timestamp was off by 60 minutes).

I believe the code here can be adjusted to avoid the problem.

See the issue I posted on this date.

Note: This issue has been fixed.