A guest who can't open their invite sees one plain line about why. What it says tells you what happened.
That link's expired, or We don't recognize this link: the link is wrong or no longer exists. A character went missing when it was copied, the event was deleted, or you removed that person from the event. Copy their link from their row and send it again, or invite them again.
Rachel cancelled Backyard cookout, with your name and the event's: you cancelled it. The page says they don't need to answer.
Backyard cookout is over: its end time has passed, or six hours from the start of an event with no end time, or you archived it. Answers close then.
This invite is for Sam. Ask Rachel for yours: a guest's own link reached someone else. The person holding it can't answer as them. Add them with Invite, or share the event's link.
This event is full: someone tried to join through the shared link with public replies on, and the event has as many invites as it can take, 30 free or 150 paid.
This invite didn't load: a one-off on our side. Trying again usually works; if it doesn't, write to help@simpleinvite.app with the event name.