Does it?:
Thank you very much.
Catalyst 9200/9200L and 9300 do not support VSS because they already have stacking.
9400, 9500 and 9600 support VSS (aka Switch Virtual).
Except point 1 - everything works as expected ( VSS - new Term StackWise Virtual ) not support in this modell, but traditional stacking allowed and supported.
here is the datasheet for cross verifications :