Git push results in "Authentication Failed"

If you enabled two-factor authentication in your GitHub account you won't be able to push via HTTPS using your accounts password. Instead you need to generate a personal access token. This can be done in the application settings of your GitHub account. Using this token as your password should allow you to push to your remote repository via HTTPS. Use your username as usual.

Creating a personal access token

You may also need to update the origin for your repository if it is set to HTTPS. Do this to switch to SSH:

git remote -v
git remote set-url origin [email protected]:USERNAME/REPONAME.git

On Windows, try the below steps to edit or remove the saved credentials:

1. Click Start
2. Type: Credential Manager (on Windows 10, this is under "Start → Settings". Then search for "Credential Manager")
3. See the Windows Credentials Manager shortcut and double-click it to open the application.
4. Once the application is open, click on the Windows Credentials tab.
5. Locate the credentials that you want to remove/update. They will start with "git:" and might begin with "ada:"
6. Click on the credential entry. It will open a details view of the entry.
7. Click Edit or Remove as required and confirm.
8. Later rinse and repeat as necessary.