Hello,
Based on your description, you can try the following steps:
- Try clearing your browser cache, cookies, and other temporary web data, then close and reopen your browser before trying to access the Microsoft Learning Sandbox.
- Log out of your current browser login and try logging in from an incognito window or private browsing mode.
- Alternatively, switch to another browser and try the login process again, making sure there is no historical data or plug-ins interfering with the login process.
Best Regards,
Yanhong Liu
============================================
If the Answer is helpful, please click "Accept Answer" and upvote it.