We had a large discussion of this on Discord, but I’m posting it here because Discord is really bad for reporting bugs.
The phone drop that starts the mission Fog and Mirrors seems like it’s RNG based. You might get it, you might not. It’s possible to get no phone drop which has happened to me today. So I’m effectively locked out of doing Fog and Mirrors today. This is an event-only mission. There should be no RNG. We had this happen once before and Funcom assured us that there would be no more RNG for event missions. Of course, that was in TSW so maybe it went out the window along with the promise of “no lockboxes, ever.”
I can also confirm that killing champions while they are on CD will NOT drop the phone. I farmed a few for a while. The phone drop should be guaranteed from the first champion you kill in a day whether it’s on CD or not.