I tried to do the sever mission last night and today...error code everytime. I am on Xbox one I played/tried on mine and my sons. Same error same spot. It is as I am about to defeat the cabal boss after power goes out. I did a slew of other activities and world roaming no other issues.
Same for me, but without a fireteam.
The power goes out and I start fighting the boss. They go over and stand behind some crates and stop taking damage or attacking me. I then get returned to orbit with the calabrese error. Happened twice in a row in exactly the same way, down to the position of the boss.
Platform: PC
Network issues: none
Other errors experienced: none - had been playing Haunted / Witch Queen content for hours beforehand
Same error experienced in other situations: never