@Puffysmoke, have a look here:
https://forum.literatureandlatte.com/t/grammarly-quit-working-suddenly-in-scrivener/128943
Apparently Grammarly made some change which broke its compatibility. You can follow there to see when others see it back again…
I wouldn’t fool with Scrivener installs as this seems unnecessary, but it seems there should be some workarounds to tide you over. If the desktop app doesn’t have its own editor screen where you could copy-paste sections, seems the web browser version ought to help cope. I’m sure you’ve thought of such things 