Running TSS r16.0, the TSSIM is no longer working with VOLUME class.
You have to use $DASDVOL instead of $VOLUME when using TSSSIM since permission is done with (G).
If you wan other details about TSSSIM go to:
https://docops.ca.com/ca-top-secret-for-z-os/16-0/en/troubleshooting/using-the-tsssim-utility