Portal does not work at Ardura Caravan !!

I completed ascent to power quest and defeated the final monster. Before I choose my ascendency I opppened a portal to go back to home (caravan) then I wanted to use again portal to back but does not work. Portal shown on game but does not work. Please support. Quest broken !

You are not supposed to leave the place before you choose your ascendancy. You have to wait until you find the next coin (100% drop from the 2 big vultures in deshar).