Yeah, this is the built-in instant action Caucasus cold start mission (went with that to rule out user error), but it's the same in any mission I've tried. The mission (and presumably any others) work fine on my laptop, I can only imagine something got corrupted in the files somewhere on my desktop (where this was recorded), wherever the comms functions are defined. Just don't know where to look, since I already deleted and repaired dcs.openbeta/mods/aircraft/F-5E.
I think it has to be the module though, not something else, because I tried it with the Hornet and it worked fine. I don't think it's a mission issue either, since it happens on any I've tried, including a new one in the editor. Even if it was a coalition issue, I still think I'd get the "Connect ground air supply" voiceover, just not the "Copy". If you have any troubleshooting suggestions though, please let me know.