I was in the same boat as you and it finally unlocked today,it just takes too much time.I think time also passes while you're playing online,at least that's what happened to me while I barely did anything else on the story mode before the icon popped up,so if you're into online spend some time there and regularly check if the mission becomes available.I don't think it's a bug either since the only time that the epsilon questline reportedly gets bugged is after you deliver the cars and you seem to have passed that with no problem.
I'm not sure what's the case with the Minute Men to be honest.
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