As I posted elsewhere, Chiron II only allows one BO to be selected if you use it as the first custom map.
To the OP, if you want a work around, insert a ground objective prior to the one on ESD. Make it, say, Federation Interior 01.
You will be able to set an away team then if it's like the Chiron II bug. You just can't use the bugged maps as your first ground map in a mission. It will work fine if there's a ground map before that.
I shall give that a try - thank you, Leviathan99.
I have some ideas to expand upon the action and the plot.