Cannot published gem using "rake release"

[dentarg]

Same as twingly/capistrano-twingly#48, but adding an issue here for visibility

Trying to release with the rake task just hangs, the output about the error came after I hit enter a few times:

$ bundle exec rake release
twingly-url 6.0.2 built to pkg/twingly-url-6.0.2.gem.
Tagged v6.0.2.
Pushed git commits and tags.


rake aborted!
Pushing gem to https://rubygems.org...
You have enabled multi-factor authentication. Please enter OTP code.
Code:   You have enabled multifactor authentication but no OTP code provided. Please fill it and retry.
/Users/dentarg/.gem/ruby/2.6.3/bin/bundle:23:in `load'
/Users/dentarg/.gem/ruby/2.6.3/bin/bundle:23:in `<main>'
Tasks: TOP => release => release:rubygem_push
(See full trace by running task with --trace)

I completed the release by doing

$ gem push pkg/twingly-url-6.0.2.gem
Pushing gem to https://rubygems.org...
You have enabled multi-factor authentication. Please enter OTP code.
Code:   414317
Successfully registered gem: twingly-url (6.0.2)

[dentarg]

It looks like the fix in bundler is in v2.1.0.pre.1.

Time to try to go to Bundler 2 I guess. I'm still using:

$ bundle --version
Bundler version 1.17.3

[dentarg]

I changed our MFA settings to "UI only" (needed for #135 anyway), so we can close this.