If you set up your instant sandbox between May 31, 2023 and June 5, 2023, you will not be able to access your tenant due to a technical issue. Please go to your Microsoft 365 Developer Program dashboard, sign in with your Developer Program account, and choose Set up subscription to get your new instant sandbox.
After you set up your new instant sandbox, please sign in with your admin account within 14 days. We apologize for the inconvenience.