I recently changed the password on one of my github accounts, and right after, I've been getting plagued with popups trying to log into GitHub. I've tried clearing all the saved logins from both SourceTree & windows Vault. I've tried uninstalling, removing everything from the sourcetree/atlassion appdata folders & reinstalling, I've tried cloning a new version of the repo. I've tried restarting pc. I've tried installing the latest version of GCMfW. I've tried disabling the automatic remote checking of repositories in SourceTree. I've downgraded to SourceTree 1.9.9. Everything I've tried seemed to change nothing.
I decided to try & download GitKraken to see if it has the same issue, however that works flawlessly right off the bat.
Sourcetree relies on the Git and the Git Credential Manager (GCM) that is bundled with Git for Windows to handle credentials for Git actions. I believe GitKraken uses libgit2 and hence a different mechanism for managing credentials.
There have been a few issues with the GCM recently. Can you try upgrading to the latest GCM by installing Git for Windows 2.20.1?