cannot start seek acid hunter mission

[requiem519]

Hi.

So I finished everything that needed to trigger seek acid hunter mission for JKK. However nothing happened.
I saved Buzzer and talked faceless with him.
I got the mobile phone and read the message.
I saved Hugo from gangsters.
I beat everybody in Arena and became the Invictus.
I finished all mission with Vivian in JKK.

However when I went out of the Arena nothing happens. I went to JKK also find nothing new. Is there a problem in my game?

[requiem519]

Ya, I talked to them long ago when I saved Hugo from Foundry. Now they disappeared.

[requiem519]

But I met Maxim at the entrance of Arena. Do I need to finish Oculus mission before I trigger seek acid hunter mission?