Huh...? But the discord invite link doesn't have any expiration date set, nor it's not invalid - just now I clicked it to prove it to you
It's not the link's fault, you may want to check this one (altho the result will be the same most likely): https://discord.gg/recgame
Afaik the problem is either in your discord account, IP address or just discord being a bitch, try googling the problem or asking AI, but make sure to include that the link is not working only for you