In BK 1.0, once you had invited a person to a fellowship, you did not have the option to re-invite them unless they left or declined.
I was asked to invite someone (while playing them), which i did in the normal manner. After a while they said they had not received the invite, so i returned to there profile and it let me do it again (I did get a message say they may have already received an invite though). Same outcome 4 times. In the end i told them to just search for the fellowship and they were able to join. Bug ???