So I am at 15mil atmosphere, have the tech unlocked, have the drones to build the atmosphere scrubbers, along with the resources, but it has not showed up on the construction panel as an option. What could be the problem? Thanks!
Try to look on the Construction Drone building list, from the menu shown when you click on the unit.
I can't find them either, clicking on the drone doesn't bring them up. What section are they supposed to be under
https://www.my-colony.com/reference/general.html#AtmosphereScrubber
It looks like they should be under resources. Link above has all the requirements for them, so check to make sure you have them all including the resources.