two-factor auth enabling problem

I'm trying to log into redmine.org which I haven't done for a while, and it is asking
me to enable 2FA:

"Scan this QR code or enter the plain text key into a TOTP app
  (e.g. Google Authenticator, Authy, Duo Mobile) and
  enter the code in the field below to activate two-factor authentication."

I'm not using a mobile device, don't want to touch google, and don't see authy in
ports/security.

Looking at ports/security I found totp-cli and installed it (pkg install totp-cli),
but it's not clear to me how to proceed.

I presume I'm supposed to somehow enter the plain text key presented by redmine.org
and get a OTP back?

I tried
   totp-cli instant <plain text key presented at redmine.org>
which did nothing, didn't even exit.

Somewhat lost here... any help much appreciated

Gary