This is a guess, but it sounds as though the TKS System is not implemented on the SR22.
The windshield is not de-iced by fluid, so it makes sense that the functionality of the windshield deicing system works on both aircraft.
That said, there are simply too many issues with the SR22 - other than no FIKI functionality - to make it enjoyable (for me) to fly. That aircraft was the sole reason I opted for the Premium Deluxe edition of MSFS. It’s a shame that it is not better modeled.
When I was “flying” in FSX the aircraft I spent the most time in was a third-party model of the SR22 built by Eaglesoft. I guess I was expecting too much for a “stock” aircraft to be on the same level as a well made third-party offering.