Am I missing something / Beginners questions

[Happy Hedonist]

If I may, I'd like to ask a question or two as well. I just bought the game a few days ago and so far I'm really enjoying it. However, a few things have me stumped. I've read through the manual a couple of times so chances are I'm probably just missing something here. Also, the only other JTS game I've played is Squad Battles so that may have something to do with it as well.

I'm playing scenario #709_05 Hell 253.6. I'm currently on turn 3. Hex 8,9 contains an objective with a question mark overlapped upon it. For reasons I don't understand, my units are unable to fire upon the hex, regardless of the fact it is visible and within range. I receive the message 'Unit has no valid targets in hex. Even indirect fire reports 'fire on empty or unspotted hex' regardless of the fact that the hex is spotted (I think at least).

Also, can anyone recommend a few good scenarios for a beginner to learn the game with? I'll be playing the AI for at least a couple of weeks before I'm ready to try a HtH. I'm going to keep working on 253.6 until I figure it out, but I was wondering where to go from there.

Thanks for reading,
Scott