Are you on Quartet or symphony?
I'm on 2018 symphony, having recently updraded from quartet.
I never had this issue on quartet.
Interestingly, I tried reducing the number of universes that capture used in the connectivity options.
I'm using 9 universes and first tried setting capture to 10, still no universe 1. Then I set capture to 9 universes and now universe 1 is listed and selectable.