Are you trying on v3? It has been a while since I have tried it but the last few times conditional moves weren't working there.
Are conditional moves not working?

You could put in a ticket. I imagine there is already a bug report in on it but I don't know that for certain.
https://support.chess.com/customer/portal/emails/new

I am still having the same thing happen, but its not a serious problem, doesn't do anything besides waste time until I log in again, so I haven't officially reported it. Using v2 with firefox.

I am still having the same thing happen, but its not a serious problem, doesn't do anything besides waste time until I log in again, so I haven't officially reported it. Using v2 with firefox.
Yeah, if the problem is only in v2 nothing will likely be done. I know it used to work but it is possible work on v3 broke it.
It might also be possible that fixing it in v3 might fix v2 though.

It has worked for me twice in the past week and the conditional moves were from my opponent. Forgot to mention in prior comment I'm on version 3.

The easiest way to tell is if you have the option to switch if the main menu is on the top or left. If you do, you are on v3.
If I get to a point to test conditionals soon, I will. Though, I have seen some people say it is working in v3 but not v2 so I don't know.
In the past 24 to 48 hours I've used conditional moves in 2 different turn based games, and that window said that the lines were saved, but the games stopped when my opponents made their (definitely expected) moves and just stayed on my turn. Its not really a problem, but it wastes time. In one of the games, my opponent had only 1 legal reply, so of course I wouldn't make my prior move without knowing what I was going to do next...
Anyone else experiencing this? (July 2 - 3, 2016)