I couldn’t figure it out computers are not my specialty
You say this often yet you have been able to download / install Steam, buy Planet Zoo plus DLC packs, as well as register here and post, not to mention upload stuff to the Workshop.
I'm starting to suspect a troll here as you continue to repeat things a lot, which helps nobody.
We understand "computers are not your specialty"
We understand "you don't know why" this is only happening to you
You do not need to repeat these things again.
I assume you have tried with different animals in different enclosures?
Start a new Sandbox.
Make an enclosure from hedges.
Put some Peafowls in it.
Get a vet, cleaner, mechanic and keeper.
Make sure the enclosure gate is linked to the path.
Build a simple, not themed quarantine.
Put it a little away from the edge of the path and use the staff path to get to it.
Remember, the path should snap to the entrance.
Press play and watch the Peafowls get delivered to the habitat (you'll have to tell them to go in there).
Only when they're in and the staff have left the enclosure should you pick one and see if you can move it to the quarantine.
Do not click pause at any point when you start running the game again.
Provide a screenshot of your enclosure or if any errors occur.