Cannot Access Training and Certification

This appears to be an authentication issue with accessing AWS Training and Certification. Based on similar reported issues, there could be several reasons for this login loop:

1. There might be a mismatch between your AWS Management Console credentials and your Training and Certification account. AWS Training and Certification now uses Builder ID for authentication, which is separate from your AWS console credentials.

2. If you previously accessed Training and Certification with an Amazon login (using phone number) but now it requires an email with Builder ID, you may need to merge your accounts.

3. Browser-related issues could be causing the redirect loop. Try clearing your cache and cookies, using a different browser, or using an incognito/private browsing window.

4. Verify you're using the correct URL for AWS Training and Certification.

If the issue persists, you should contact AWS Training and Certification support directly. They can help you resolve account access issues and potentially merge your accounts if needed. You may need to provide information to verify your identity when contacting support.
Sources
URGENT HELP! AWS Training login issue. | AWS re:Post
something is very wrong I can post questions here but I can't sign into the AWS management console | AWS re:Post
Unauthorized access to the aws console with my root account | AWS re:Post