SoureTree with bitbucket.org suddenly stops working on both Mac & PC

[sgolby]

All of a sudden I can't pull from bitbucket.org with SourceTree, I get

fatal: Authentication failed for 'https://

I can login to the Website and view my repos fine. 

I have reset my password many times and removed the special characters, when I re-add the password on the Tools -> Options -> Authentication tab I get "Authentication OK" and a little green check mark.
I've followed pretty much every suggestion here. I have removed the stored credentials, checked for Proxy issues, Changed from Basic to OAuth, etc, etc.

https://stackoverflow.com/questions/20953940/authentication-failed-to-bitbucket

After doing all that on my PC, I booted my Mac & I get the same issue!  it was all working the other day & they are different versions of SourceTree, the Mac one hasn't been touched.

v3.0.12 PC

v2.7.6(177) on Mac

Anyone know what's going on here?

[sgolby]

I've made some progress, I found this stale 2016 passwd file at this path & deleted it

https://community.atlassian.com/t5/Sourcetree-questions/Getting-quot-fatal-Authentication-failed-for-quot-error/qaq-p/624663
> The only thing that worked for me was navigating to C:\Users\USERNAME\AppData\Local\Atlassian\SourceTree and removing the passwd file.

I can push/pull but now I get 2 of these errors and 1 OK.
fatal: HttpRequestException encountered.
   An error occurred while sending the request.

That same article has this info for Mac
> For anyone else looking for that path it is ~/Library/Application Support/SourceTree and then look for a file similar to username\@STAuth-path.to.gitrepository.com

I'm going to look at this next, although I have updated the Embedded Git already.
https://community.atlassian.com/t5/Sourcetree-questions/Unable-to-authenticate-on-Windows-using-username-password/qaq-p/954836#M26404