Exclude players from PlayStation party?

My friends had a party for two and invited me. However, I can't join the party. Every time the message "Can't join the party due to party or player settings. How do you create such parties?
ps: the party has 2/16 players

That means you were excluded or one of the two players in the party blocked you.

If you weren't at the party before and were expelled, someone blocked you from the party.

If you were not excluded, one of the players blocked you. If you want to join the party again, you have to create a new one or stop who blocked you