Some info of use:

If you get a WP invite, and you decline, it sometimes/often dissappears for others that may have been invited, so is best not to, but say in chat you can't do it.

Keep WP's to maximum of six players, if more this can adversely affect the server, and game stabilty for others (all, not just those in the WP).

Sometimes an invite sent does not appear on the invited payer's map, in this case it often works to unfriend the player, then refreind and reinvite.

AlbertRoss