It always says:

fatal: could not read Password for 'https://USERNAME@bitbucket.org': Device not configured

Fatal: Could not fetch FEATURE/HOTFIX from origin.

=> I have this problem sins several versions, non of the fixes out of the threads in the community board are working...
I've deleted the repo and cloned it again, I've deleted the account and reconnect it, I've deleted all Bitbucket passwords from keychain and I checked the origins url and added the username... 
Nothing works, it used to work well, then it sometimes work with some repos and with other not and no it seemed to not work at all anymore, so annoying, source tree is unusable on Mac this way! The Problem is there since 2018!?