I have both the GS Air-M and Pico and use them together regularly. (I am actually using them right now lol.) As others have said, something is not making a connection or else there's something wrong with the coil itself. The way you described the pin of the GS Air is how it's supposed to look.
Which of the air coils are you using?
Make sure the coil head itself is screwed into the base fairly tight, or at least has not come loose. If it is not making a full connection with the base, you'll get that No Atomizer error regardless of whether or not the pin is making contact.
If this is your first time trying to use this tank and the first coil, it may be worth trying a different coil in case you have a dud.
If everything looks good with the tank, do what
@Sugar_and_Spice suggested to push up the 510 pin of the Pico some. This might solve the issue.
I may be missing something, but if
none of those things work, then maybe there's an actual issue. I have a feeling it's something relatively simple like that, though. Normally they pair well together!
Consider taking some pictures of the bottom of the tank and the pin of the Pico if you can't manage to get it working.