The reason they couldn't communicate was because the prospitian ship was in the yellow yard, which was completely outside the canon multiiverse and instead in hussie's workshop, while the meteor was in the outer ring, which is between universes, but still in the canon multiverse, so there was no way for radio waves to travel between each other to allow internet or phone connection

Answer to the question of why didn’t the kids communicate with each other during the 3 year journey.