So I am in the temple and trying find my way. I go through to the Temple of Miraak Sanctum, where my compass arrow is showing, and when I get on the other side, I get an arrow on my compass that shows that I don't have to go through a door to get to my target. I throw a clairvoyance spell, and it shows to go right back through the door I just came in through. I am so confused. Can anyone help me at this spot?

it's all about looking for doors that weren't previously opened. You need the eyes of a hawk to spot them.

There is a set of stairs there or a downpath that is hard to see. It took me a while to find it.

Good hint.....ok I am gonna look some more.......

I found the door, but where is the key? I have looked everywhere inside.

There's a Draugr that has the key, he's named Gatekeeper.

Do you have that female skaal follower with you? I think, but I am not sure that one of the cultists or something has a key. Does it say that a key is required? Crap. I do not remember some things very well

There is a Drauger in the same room as the exit, one of them has the key.

Oh, thank y'all so much!