As we understand from your post, you are unable to sign in to Microsoft Learn Sandbox.
Please keep in mind that you can only have one personal account (MSA) associated with your Learn profile at a time. To change it, you must use an alternate work or school account to sign in with so that you can remove the current personal account and add a different one. If you do not have an alternate work or school account, you will have to change the personal account on your certification profile to align to your Learn profile or create a new Learn profile using the same personal account as your certification profile.
- If you already have one or more work or school accounts associated with your Learn profile
- Sign in to Learn using a work or school account.
- Go to the “settings” page in your Learn profile.
- Under the “Account management” section, remove your current personal account (MSA).
- Select “Add account” and sign in with the personal account (MSA) that you use for your Certification Profile.
- Sign out of Microsoft Learn.
- Sign into Microsoft Learn with your newly added personal account (MSA).
- Complete the certification profile connection process.
If you find the provided information beneficial, we kindly request your acknowledgment by utilizing the "Upvote" and "Accept Answer" options on the post.
Should you continue to encounter issues, please provide screenshots of the errors encountered. We will be glad to assist you further.
(NOTE: Please ensure the concealment of any private details before sharing).
Thank you.