Unable to clone a repository - invalid credentials

[Robert Bradshaw]

Error: remote: Invalid username or password
fatal: Authentication failed for {URL}

No matter what I do, I get this message.  I have already cleared all of the credentials saved in Windows Credentials Manager. I have updated my username/password on atlassian, I have uninstalled/reinstalled source tree several times, and I am just out of ideas. What on Earth do I need to do to get source tree to recognize me???