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Sometimes, cached data can cause login problems. Try clearing your browser's cache and cookies, and then attempt to log in again or try logging in using a different browser to see if that resolves the problem.
Make sure that the password you're entering is correct. If in doubt, you may want to try resetting your password through Microsoft's official password recovery process.
Some labs might require third-party cookies to be enabled. Check your browser's settings to see if this might be causing the issue.
If none of these solutions work, you may need to reach out to Microsoft's support team. They would have the tools and access required to diagnose and fix the issue with your account. You can usually find support contact information on the website where you're taking the course.