Just to be clear, the below is all about using the Microsoft Japanese IME that comes in Windows 10. Different versions of Windows IME should work similarly, but I have no idea about third-party IMEs such as ATOK.
Here's what I see when I change to Japanese input mode and type
Remember -- you also have to hit the spacebar to tell the IME that you want to convert. That initial pop-up is the IME's attempt at predictive completion. It doesn't convert anything until you hit the spacebar.
After you hit the spacebar, the current kana string (with the squiggly underline) changes to whatever the IME has as its first conversion candidate. In my case, the kana are にじ, and the kanji it changed to is 虹, since that was the kanji I've apparently chosen either most often, or most recently (I forget which), as the conversion for the kana にじ. When I hit the spacebar again, I get a pop-up showing all the conversion candidates:
If this is what you're doing, and you don't see 二時 anywhere in the list of conversion candidates, something is seriously wrong with your IME configuration. Any fix of that is beyond the scope of this answer.
Hope this helps!