I obtained this reply from Discord:
Hey Rune,
Sorry in regards to the invite troubles! There might be 3 prospects of a hyperlink being expired:
– The hyperlink itself is expired
– The IP is within the bans listing for the server
OR
– The consumer is already a member of 100 servers
If you possibly can contact the server admins, may you ask them to revoke all of the bans of their server settings > bans menu even when the Discord Tag is not on the listing? (This can occur unintentionally for any variety of causes.) If that also fails, share the hyperlink with me and I’ll be capable to let you know precisely which of the primary two choices it’s.
I’m not a member of something like 100 servers, extra like 10. 
