No shadows on Parallels Desktop on M1 Pro mac

I had the same issue but was able to solve it following the advice here. 

To summarize, for anyone running Sims 3 on M1/M2 Mac Parallels Desktop: 

In the following folder:   Program Files/EA Games/The Sims 3/Game/Bin

1)  Edit the file GraphicsCards.sgr file.

     Add to the end of file:

       vendor "Parallels" 0x344c5250
              card 0x3030 "Parallels Display Adapter"
              card 0x353030 "Parallels Display Adapter (WDDM)"
       end

2)  Edit the file GraphicsRules file in the Bin folder.

     Add the following right above elseif (match("${cardVendor}", "NVIDIA"))

       if (match("${cardVendor}", "Parallels"))
              if(match("${cardName}", "*Parallels Display Adapter (WDDM)")
                     seti cardLevel $cardLevelUber
                     seti isCardMatched true
               else
                     seti cardLevel $cardLevelUber
                     seti isCardMatched false
               endif
               setProp $ConfigGroup RenderShadowMode 2
               setProp $ConfigGroup ShadowMapAllowNullColor 1 

This should get your graphics card matched, found, and the shadows working.