It depends on if the server you are playing on even has factions. If so, type
/f create (factionnamehere) to make one
or /f join (factionnamehere) to join
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To answer a faction invite just do /f join <faction name>
I assume you're talking about a faction invite. the command is /f join <faction>
Either ask a member or ask the Administrator of the server.
To invite someone to your faction in Minecraft, do /f invite <player name>. They then need to do /f join <faction name> to accept your invitation.
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