Just like the liaison between the lycans and the centaurs, the liaison between the lycans and the vampires was also a complicated one, because there was a long history between the two kinds in the past.
It was a bloody relation until the peace treaty was signed by both parties involved, yet it didn't mean everything was sunshine and rainbows between the two of them, it was more likely the silence before the storm.
The vampires needed access to the human world, as some of them lived in that realm, just like how the lycanthropes would go back and forth between the two realms.
But, recently, Micah made a stern warning to the vampire to not step foot on their territory, whether it was in their realm or in the human realm.
Which meant, they could not move freely because their access was restricted, as it went without saying that the territory of the lycanthropes was much larger than that of the vampires.