[Raptor Boss not Spawining on a Kuva Flood Mission]

I tried various things in the past 15 min but to no avail nothing worked so had to abort. 😞 

[Raptor Boss not Spawining on a Kuva Flood Mission]

I was set in public so I received 3 other people in my group to do the kuva flood mission. There was a transfer host migration at the start of the mission. We then went to complete the flood and when proceeding to go to the boss nothing spawned and said we need to Destroy Grav Conveyers 0/0 with no Raptor boss Spawning. It really sucks because I was super lucky and got 3 smeeta buffs to happen and was going to receive 38,464 kuva at the end of the mission. 😞 hoping I can get sent the kuva but just wanted to post the bug