Finishing all interlude but cannot accest to endgame

Hello,
With my rereoll character, I Just kill the last boss of intrerlude (Zolin and Zelina). All the other interlude are also completed. Unfortunately, I cannot access to endgame. When I try to load a map, There are an error message :
You cannot access endgame content until you have completed the campagn.

I try to going back, in the arena. One of the boss was still alive and atack me. but he has no live, impossible to kill. I try to restart the zone, no combat is possible anymore!

Could you please have a look?

Thanks!
Great game, BYTW

You need to start your first map from The Ziggurat Refuge.

After that you can also use your Map Device from your hideout.

Edit:
Or don't you have spoken to the Hooded One in Kingsmarch (Act 4), to travel to the Ziggurat Refuge (Quest Siege of Oriath)?

Thank you!
It was not so easy. but i add to return to act 4 to speak to the hooded one. After that I can access. Thank you for the help.