unable to update url base from redirection

[ZaxR]

I'm having trouble authenticating. When i try the username/password, I'm being given the error in the title. What am I doing wrong here?:

Using the following:

resources:
  - name: pullrequest
    type: concourse-bitbucket-pullrequest
    source:
      username: ((bb_user))
      password: ((bb_pass))
      uri: http://git.xxx.com/projects/SS/repos/some-repo

I receive this error:

Resource script '/opt/resource/check []' failed: exit status 128

stderr:
2019-11-25 21:35:02 - Configuring git credentials
2019-11-25 21:35:02 - Parsing payload
fatal: unable to update url base from redirection:
  asked for: http://git.xxx.com/projects/SS/repos/some-repo/info/refs?service=git-upload-pack
   redirect: http://git.xxx.com/login?next=/projects/SS/repos/some/info/refs?service%3Dgit-upload-pack

[ZaxR]

If I try the same thing with a personal access token instead of username/password, I get:

resource script '/opt/resource/check []' failed: exit status 128

stderr:
2019-11-27 20:06:05 - Configuring git credentials
2019-11-27 20:06:05 - Parsing payload
fatal: repository 'http://git.xxx.com/projects/SS/repos/some-repo/' not found

resource script '/opt/resource/check []' failed: exit status 128

stderr:
2019-11-27 20:06:46 - Configuring git credentials
2019-11-27 20:06:46 - Parsing payload
fatal: unable to access 'http://git.xxx.com/projects/SS/repos/some-repo/': The requested URL returned error: 400