Hey Solo! I thought I'd give you a heads up that I had that problem and after trying the command you had put and trying it over and over again with different variations and it still not working, I took to google and found out you made a typo. You swapped the r and the c in -rc. [xattr -rc] is what worked for me.
Hi, thanks for the heads up!
But I'm sure -cr works on my MacBook(I really don't know why) and I got the solution from here:
https://apple.stackexchange.com/questions/372084/macos-catalina-app-is-damaged-a...
Anyway, I'll add yours to my post too, thanks again!