I have had this problem for ages, years. It's totally doing my head in.
I have done clean installs, tried to gouge out any remnants of SourceTree profiles (as far as I can tell), but it just keeps happening.
I continuously get a popup (see inserted photo) that prompts me for my Bitbucket credentials. I have entered them countless times and they are correct. I use them to login to the site just fine. I can push commits to my private Bitbucket repos with them. It doesn't matter what I do, this popup just keeps on trucking.
Any ideas before I put a shovel through my screen !!!!
Am on Windows 10 using SourceTree version 2.1.25. This has been happening on all version as far back as I can remember.
