App password error when attempting to clone a repo

[ron_a_williams]

I'm attempting to clone a repo owned by someone else that i have access to. I can view it on the website just fine. When attempting to clone the repo in Sourcetree I get "This is not a valid source path / URL" . When clicking details i get the following:

Command: git -c diff.mnemonicprefix=false -c core.quotepath=false --no-optional-locks ls-remote https://{username}@bitbucket.org/{other_username}/{reponame}.git
Output:
Error: Logon failed, use ctrl+c to cancel basic credential prompt.
remote: To make a call, you need to use an app password.
fatal: unable to access 'https://{username}@bitbucket.org/{other_username}/{reponame}.git/': The requested URL returned error: 403

I've removed the user names and repo name for obvious reasons. I have 2FA setup on my account and I am using an app password. I have no clue why this is happening.