I did everything described here for my bitbucket repo:
I got this inscrutable error when I tried to use sourcetree to do a test pull. What to do next?
I'm not absolutely sure but it looks like the main issue here is Host key verification failed message, and that error might be causing the rest of reported issues.
This error generally means that the host key of the remote host was changed, however Bitbucket hasn't been updating any SSH keys for a long time, so there's likely something else in your setup that is causing the error.
For instance, you might have had some custom configuration of SSH client or hosts file. Unfortunately, it's hard to guess without additional information.
What you can check is Sourcetree log file – it might give a hint what hostname did Sourcetree try to reach. On Windows the log file resides here:
The easiest would probably be to clear that file, then reproduce the error and check it again right after that.
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