Playing as Archaon in Immortal Empires one of my current vassals captured the capital city Karak Vlag. Since this was a capital and I wanted it I went into the diplomacy and made the vassal gift me the city. This capital city is associated with a different Norsca faction. I then went to capture a minor town near there and gifted it to the new vassal but after doing that the AI did not do anything at all and the garrison constantly stayed at 0. I am also unable to interact with them in the diplomacy. To try and resolve this I abandoned the capital city and recaptured it. That did not work though. I see them as my vassal on the world map but can not see them in the diplomacy menu like my other vassals.