MSIX App Attach - VHDX doesn't get mounted to hosts

Yes, both packages are set to active. I have gone through multiple walkthoughs, including Stefan's detailed videos. Everything seems to go fine until it gets to the step where the VHDX should get attached to the hosts. Definitely acts like a permissions issue since it also won't let me manually attach the drive when accessing from the Azure file share path. But I've confirmed my hosts security group and my users security group both have permissions to the Azure file share. But the odd thing is, as I understand it, the package is attached to the hosts and checked for issues when uploading the package and that part works fine. Just doesn't seem to make sense. At this point I'm thinking maybe the feature just doesn't work properly yet in GCC High.