Azure : Deletion of system application is not allowed : Tenant Schema Extension App

Hi,
Trying to delete an old tenant but can't delete Tenant Schema Extension App in the checklist as it says "Deletion of system application is not allowed". I think it was related to Azure AD Connect and I removed it from the server before. Tried to open a support request to Microsoft but got referred to this question (https://learn.microsoft.com/en-us/answers/questions/730895/azure-deletion-of-system-application-is-not-allowe.html) to open an Azure ticket instead and I don't have an active support contract on that subscription as we are trying to remove everything from it.
Is there another way to delete this application?
Thanks
Marcos