I did some thorough searching for duplicates of this question, but I don't think they really cover the same spirit of the issue I'm having. (here are some examples of similar but different questions) ...
How best to handle revealing a main character's name midway through a long story in close-third person?
I'm writing a novel, and it's written in close third person perspective, very much sitting on the shoulder of one main character and privy to their thoughts. There is another very important character ...