Are there any knowledge spots you cant find or solve?

I know treasure hunter trin  giving me a hard time. I have calpheon bell, riot area, everything in calpheon but he just won't talk to me. Best thing I found online had 3 pre reqs, and I have done them and have the knowledge entries to double check.

Another is the lighthouse arc in sand grain, cant get the first one but did everything there to include val1 and val2.

Figured out a bunch through trial and error,  I can help with other ones if any one struggling.