This looks like an SSH issue to me, there's various reasons why it could happen. Here's a few things worth troubleshooting:
Perhaps you could ensure your public key is present in ~/.ssh/ first? And then we can check if it's correct from there, ensuring it matches the servers public key.
Supported Platforms macOS Sourcetree has a lot to offer and, like many developer tools, finding and using it all can be a challenge, especially for a new user. Everyone might not love ...
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