Thank you for contacting Atlassian Community, my name is Norbert and I'm a Bitbucket Cloud Support Engineer, it's nice to meet with you!
Based on my observation, you're trying to authenticate your SourceTree client with an account password, but we've deprecated it with March 1, 2022
To resolve this issue, can I ask you to generate an app password and update your SourceTree client so that it's using the app password?
Please let us know how it goes.
Best Regards,
Norbert
Atlassian Bitbucket Cloud Support
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