I didn't have a problem with chapter 10 requests but had issues with chapter 7. Not entirely sure how the request system works but was stuck on 18 all day and some neighbours who are actively playing that day, never received the requests. My guess is that 20 players who log in first, receive the requests. However, some lower level players who are not doing the storybook event may log in just once a day, receive gifts but do not accept them so if they don't scroll down their news feed, they won't see the requests. The last 2 came in quickly, 24h later after reset so I was able to start Chapter 8 without much delay or skipping with gems.