The Check App Update should either return an update, or tell me "You are on the latest version of Nethunter". In my case, clicking the button returns nothing at all (no error, no update, no latest version message). I may have the same issue as this person, where I accidentally hit ignore. I don't remember doing so, but it feels a bit like the same issue.
Like him, I am not talking about the metapackages, but the Android Kali Nethunter app itself. Is there a way to force an update or reverse the ignore selection? No solution was ever posted in the other thread.