Microsoft has rolled out an update for Xbox One clubs that adjusts the invite system for clubs that have reached their maximum members. This comes from feedback from both the Xbox Insiders and data collected by the developers. With this update clubs that have reached their maximum will send invites but only a subset will actually be sent. The others will be dropped silently.
In order to avoid hitting the maximum in your unanswered invites Microsoft advises that you,
- You direct future members of your club to hit “Request to join” instead of sending them an invite
- You send smaller amount of invites to only future members you know will be interested in your club