The thing about technology is... it goes wrong sometimes. Often in games the tech is treated as infallible, whereas we all know that in reality it will fail or do the wrong thing at the worst possible moment - either through a hardware/software failure or operator error. It doesn't matter what the cause is, just throw in some dramatic failures at the worst possible moments, and watch the tension mount!
Also, wherever you read "technology" you can also substitute "magic". If you're used to spells always going off correctly or magic items always working, then mix it up a bit and throw in some random failures during important situations.
Commentary by memnarch (who has not seen the movie)
I'm not sure what holding them off for only one minute would accomplish, but there's a goal now that at least would make more sense as a movie plot point. And the Resistance flagship would make much more sense as someone(s) for Allan to talk to as well. So then the main question is, is Allan meant to be bait all on his own as a super ace pilot, or is he a distraction for other Resistance pilots to swoop in on an attack from a different angle? And for a bonus question, how many other funny faces will Hux be making for himself before the end of this particular scene?
GM: Back on the Resistance flagship, Leia can indeed hear this conversation.
Leia: Do I have a secure frequency?
Leia: Commander Dameron, I don’t know what you’re trying to pull, but if you can just hold on for one minute, we can complete the evacuation of D’Qar.
Allan: I flip my radio to single transmission.
Allan: Don’t worry, General, we’ve got this in the bag.
GM: <roll> Ben?
General Hux: I daresay we do, “Administrator”. If you’d just let us get on with the attack.
Leia: Allan? Are you there?
General Hux: But since that seems to be affirming the go-ahead, I guess we shall.
BB-8: So close, yet 50 seconds away.