Despite being in the patch notes a few times, still can’t research from the other person’s building in Co-op. Options are even there to do it.
Hey @CanadianGuitar,
We are currently working on it, but if you’re experience what I think your experiencing, for now go to Options -> Game and un-check “Hide Production Buttons When Missing Prerequisites” which should allow you to see the research options available to you when an ally builds a Guild.
Sorry for the inconvenience and let me know if the above temporary workaround does not work for you.