Authentication issue

After I enabled the Two-factor Authentication in GitHub, I can’t push the local commits to GitHub repository, and encountered the issue as follows:

How do I Resolve it

Why this issue happened after Two-factor Authentication has been enabled? I got the answer from GitHub Documentation.

Here, I just take notes for the solution. GitHub requires users to create a personal access token to replace the password when performing Git operations over HTTPS with Git on the CLI.

A personal access token is required to authenticate to GitHub in the following situations:

• When you’re using [two-factor authentication](two-factor authentication)
• To access protected content in an organization that uses SAML single sign-on (SSO). Tokens used with organizations that use SAML SSO must be authorized.

Create a Token

1. Log in to GitHub, in the upper-right corner of any page, click your profile photo, then click Settings.

2. In the left sidebar, click Developer settings.

3. In the left sidebar, click Personal access tokens.

4. Click Generate new token.

5. Name it, then select the scopes, or permissions, you’d like to grant this token. To use your token to access repositories from the command line, select repo.

6. Click Generate token.

7. Copy the token. Then you can enter it instead of your password when performing Git operations over HTTPS.

$ git clone https://github.com/username/repo.git
Username: your_username
Password: your_token    # Replace your initial password)

It works!

Tip: Personal access tokens can only be used for HTTPS Git operations. If your repository uses an SSH remote URL, you will need to [switch the remote from SSH to HTTPS](switch the remote from SSH to HTTPS).

Reference

• Stackoverflow - GitHub: invalid username or password
• Creating a personal access token for the command line