Learning Sandbox tenant stays permanently and can't be deleted

[elotosh1]

I'm reading MS online courses for preparing for an Azure certification. Some articles allow to activate a learning sandbox for experimenting. Such sandboxes are supposed to be deleted automatically in an hour. However, now I have a sandbox that stuck in my account along with other Azure tenants (pay-as-you-go subscription) I use for other purposes. The sandbox hasn't been deleted automatically by the system, and when I try to access Azure AD in it or delete it, I get 403 error (access denied / unauthorized).

Is there a way to remove that sandbox?

[#2]

I expect you are going to need to contact Azure support
https://support.microsoft.com/en-us/topic/contact-microsoft-azure-support-2315e669-8b1f-493b-5fb1-d8...
https://docs.microsoft.com/en-us/learn/support/faq?pivots=sandbox

[#3]

@Julian Sharp 

The support person on the Azure forum suggested that I should contact learning support because it's outside of their scope.

Anyways, the sandbox disappeared from my view by itself after a couple of days of waiting. Not sure what happened.