Visit a friend quest

So I took this quest,visited a friend's capital and finished a quest from his ambasador.But when i try to talk to him,nothing happens and I can't finish this quest.Anyone knows how to solve this problem?
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Head back to your home city Ambassador - it will be complete-able there.

|||Still cannot finish it.The part which says visit a city is green,but the one to finish the quest is white,even though i did finish the quest.
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Last idea then...

Make sure to travel back to the city of a friend, where you did the quest. You might get the credit as soon as you arrive in the city.

If not, look at the City Ambassador in your friend's city, if he has a yellow question mark above his head, - see what he wants you to do (likely he needs you to get your reward).

If instead the City Ambassador has a white question mark - well perhaps the quest didn't register as complete as you had thought (might be a new bug) - so go ahead and complete the quest again.

We have had some difficulty with the special setup of the friends quests, so keep me posted, and thanks for taking the time to post on the forums!

|||Nvm,I solved the problem.Seems the guy removed me from his friends list so i had to do it again with another person and it worked like a charm