GitHub authentication page page got stuck

It sounds like you're experiencing an issue with the GitHub authentication process while setting up AWS CodeDeploy. This can sometimes happen due to browser-related issues or temporary glitches in the authentication flow. Here are a few steps you can try to resolve this:

1. Clear your browser cache and cookies, then attempt the authentication process again. Sometimes, stored data can interfere with the process.

2. Try using a different web browser or open an incognito/private browsing window to see if you can complete the authentication.

3. If you've previously authorized CodeDeploy to interact with GitHub for a different account or application, you might see a "Connect to a different GitHub account" link. This could be causing confusion in the authentication process.

4. Ensure that you're signed in to the correct GitHub account before starting the CodeDeploy setup process.

5. If the issue persists, you may need to revoke the existing authorization for CodeDeploy in your GitHub settings and start the process again.

If none of these steps resolve the issue, you may need to contact AWS Support for further assistance. They can help troubleshoot any potential problems on the AWS side of the authentication process.
Sources
Troubleshoot GitHub token issues - AWS CodeDeploy
Connect a CodeDeploy application to a GitHub repository - AWS CodeDeploy