I've executed git config --system --unset credential.helper and git config --global --unset credential.helper and gone in manually via git config --system --edit and git config --global --edit and all config is empty (just name and email). I've also deleted all entries in Windows Credential Manager and rebooted my PC.
Whenever I attempt a clone, there is no prompt for credentials. As a result, I get a 403 forbidden message. Others have successfully cloned with the same command+url. Protocol is http to an internal server. I don't understand why Git is not prompting for credentials when config doesn't have anything setup. How do I make Git prompt me from credentials?
Deleting your entries in the Credential Manager was good, but you still need to restore the credential helper if you want to see any prompt:
Then the next push will prompt you for your credentials and store them.