I tried to use it both in the client and directly from the website. Both have resulted in “Unable to accept invite.”
As far as I know I’m not banned as I’ve never been on it before, and I’m in good standing in all other servers I’ve been on (just in case there is some type of ban-bot that enforces them across servers.)
I mean this works too I suppose, but I still wanted to mention it as others may have similar issues.