Windows SourceTree+github fails to push

I am trying to push the code to the remote github, but an error occurs.

I have set up the procedure by referring to this site.

Enable SSH login on Windows+SourceTree+Github

*Lastly, I thought that the procedure for using the generated key through SSH was different, so I referred to the following.

How SourceTree SSH to GitHub for Windows 10

I went through the above flow, but I got the same error.
Is there anything else I can forget or do?