Can't Delete B2C Directory - Can't Delete Last App Registration

I have an MSDN sub.  I can't log a subscription complaint unless I pay.

I can't delete the B2C subscription because of an app registration.  Directory has one or more applications that were added by a user or administrator.

I am the administrator.  I can only see the app registration in the Classic Portal.  No delete option exists for that app.

I have to delete the B2C directory because apparently the cost is going up.

What can I do?