2FA for GitHub not working in SourceTree

[Ralph Bergmann]

This question is in reference to Atlassian Documentation: Two-Factor Authentication (2FA) with GitHub in SourceTree

I set up 2FA for GitHub with a Yubikey this works fine when I use git from the command line.

But when I use it with SoureTree I get an error message:

git -c diff.mnemonicprefix=false -c core.quotepath=false -c credential.helper=sourcetree push -v origin refs/heads/master:refs/heads/master 
Pushing to git@github.com:the4thfloor/test.git
Permission denied (publickey).
fatal: Could not read from remote repository.
Please make sure you have the correct access rights
and the repository exists.
Pushing to git@github.com:the4thfloor/test.git
Permission denied (publickey).
fatal: Could not read from remote repository.
Please make sure you have the correct access rights
and the repository exists.
Pushing to git@github.com:the4thfloor/test.git
Permission denied (publickey).
fatal: Could not read from remote repository.
Please make sure you have the correct access rights
and the repository exists.
Pushing to git@github.com:the4thfloor/test.git
Permission denied (publickey).
fatal: Could not read from remote repository.
Please make sure you have the correct access rights
and the repository exists.
Completed with errors, see aboveCompleted with errors, see above

When I call this command on command line I get this output

$ git -c diff.mnemonicprefix=false -c core.quotepath=false -c credential.helper=sourcetree push -v origin refs/heads/master:refs/heads/master 
Pushing to git@github.com:the4thfloor/test.git
Counting objects: 3, done.
Delta compression using up to 8 threads.
Compressing objects: 100% (2/2), done.
Writing objects: 100% (3/3), 944 bytes | 0 bytes/s, done.
Total 3 (delta 1), reused 0 (delta 0)
remote: Resolving deltas: 100% (1/1), completed with 1 local objects.
To github.com:the4thfloor/test.git
   0c607d1..9a695cf  master -> master
updating local tracking ref 'refs/remotes/origin/master'

What can I do?

[James McParlane]

This does still does not work reliably.

This remains a terrible and broken user experience.

You are forcing people to choose between good security (2FA) or using your software.

[Ralph Bergmann]

Okay I got it. You have to use the access token as password (like it's described in the article).

The important part is that you have to access via https and not via ssh

But why can't SoureTree use the command line settings to access GitHUb?