Placing Vivarium on tutorial 2

Hello
I'm back in the Planet Zoo world with the console (XBox S) edition - I used to play on PC a while ago.

I'm starting back from scratch and doing the tutorials. And I'm stumped on the second one, the one in Madagascar with the monkeys.
I'm at the point where I have to place a vivarium in a specific highlighted place to adopt a Gila monster.
Problem, no matter what I'm doing, i can't place the vivarium in the designated spot, getting an "obstruction" message - but nothing seems obstructing.
My search-fu didn't seem to find anyone with the issue, so I'm wondering if there's trick to do it seameslessly (and sorry if the answer is already around but I missed it) ? I feel I'm missing an easy "click in the building" to fuse the new vivarium with the already present house.

Thanks in advance.
 
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