Unauthorized Sandbox use detected. Your sandbox has been terminated

Hello Community.

I started some modules to get official certifications from MS and I got this lock. I really do not know what the reason was. (Usually I use 3 different IP addresses: from work (direct and VPN) and from home.

The module where I've got the lock is the following: Describe Azure Storage Services. https://learn.microsoft.com/en-us/training/modules/describe-azure-storage-services/5-exercise-create-storage-blob 

As you can see, I already sent the appeal but I still have not received any response. I would greatly appreciate all the help you can give me.