Since the film did come out back in September of 2020 (I know, it already feels like ages ago), let’s go over what happened with the characters of Enola Holmes.
Sherlock had left a cipher for Enola to solve, one that would lead her to a meeting spot where he would reveal he’d like to mentor her.
It’s a bittersweet reunion, but one that had to happen in order to solve the mystery.
And, he approves it once he places the pinecone back down, symbolizing his blessing.