Players who are at a later progression in raid e.g: Party leader at Turn 4, party members at turn 2. Should not be the ones to initiate the entry as there is no restriction where a player who hasn't cleared later turns is not allowed into said turns without clearing those before.

This issue has been around ever since the beginning of BCoB but was only an issue when trolls decide to lock people out of their weekly loot e.g: bringing a bunch of people who thought they were in for Turn 1 into Turn 4.

With the new-ish ability to go back to earlier turns to help friends, your friend needs to be the one who initiates entrance or else you're stuck with the situation you're in now.

Imo it's a system that feels tacked on after players have requested to be allowed to help their friends in earlier turns. Anyway, nothing can be done about it other than wait another week and treat it as a lesson learned the hard way. At least now you know and will be more careful next time.