I think, I have done all things right. First I tried https. I get a box for login and password. I wrote it right but dont get access. The same work in a browser, also a private browser shell, also here in Node-Red.
Than I generated a ssh-key like in the video and put it do my github. The same - no access. I also tried to clone my project -no access.
The error-message: Authentication failed
In the log-file there is nothing to see regarding this problem.