Unable to change Git account

This has nothing to do with your user.name/user.email settings: those are for authorship in a commit. They are not used for authentication when you push to a repo.

If Git does not ask you for your GitHub (new) username/password, that means Git for Windows is using a Git credential helper called “manager” (do a git config credential.helper to confirm it)

Meaning: it is caching your old credentials and is reusing them automatically.

In that case, go to the Windows start menu (Windows start), type “credential” and select the Windows tool “Windows Credential Manager“.
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In it, you will find an entry git.https://github.com, which you can edit, and where you can enter your new GitHub username/password.
Enter new credentials

Then try and push again.


With more recent Git version (2.32+, Q2 2021), assuming <C:\path\to\git>\usr\bin and <C:\path\to\git>\mingw64\libexec\git-core are in your %PATH%, you can do the same removal in command-line:

printf "protocol=https\nhost=github.com\nusername=xxx"| git-credential-manager-core erase

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