The solution in push code when git user info changed.

[popstar7]

When I changed user info with "git config user.email example@mail.com", the info will not change in fact.
Let's discuss to solve this.

[Johnhvy]

By setting up post-receive hook, you can automate the deployment of your proxy server code to GitHub whenever someone pushes new code to your repository.

[shinevue]

Enter to Control Panel.
User accounts -> Credential Manager -> Windows Credentials
The old git user info saved there.
First remove this old info, then push again.
Then the authentication popup will be display.