Hello,
I am running into a similar issue that many have before me regarding the use of sandboxes for Azure in Microsoft Learn/Training.
https://social.msdn.microsoft.com/Forums/en-US/db65d6e0-c4c9-45a6-bba2-e57ddd6beed9/ms-learn-sandbox-creation-error?forum=WAVirtualMachinesforWindows
As I was unable to use my GitHub account, being that it is a college email, I created a new outlook email using my name. When I progressed to the "Core Cloud Services - Introduction to Azure" module, I was unable to move forward because of the
sandbox coming up unauthorized. I then appealed, as the option was given to me, but found a day later that the option had been removed and was told again that my sandbox was unauthorized.
In attempt to fix the issue, I contacted various Microsoft support services and was told to make a support ticket for Azure. As I am a senior in college and looking to use these training services for future employment, it is important to me that I be able
to resume using the modules.
Thank you for your time and I hope to hear from someone soon.