In playing with getting git’s credential helper to work on Windows, I accidentally added multiple helpers to my local config file. It took me a while to figure out where it was stored and how to reset it. I used this command when in the local repo directory.
git config --unset-all credential.helper
This Stack Overflow post got me close but was based on the multiple values coming from different versions of the config file. The key was the –unset-all option. This blog post helped explain the different scope of config files.