What were some of these technical questions and what were the answers you gave?

I know that FAANGs will likely be cautious bringing in someone with too much experience as they need to change how they have learned to work in the past. It sucks but younger people are easier to mould and are cheaper.

Did you price yourself out of a job?

I know from my experience interviewing at a FAANG that the interviewers rely a lot more on STAR based questions than the technical questions.

On top of that if you've got 8+ years of iOS experience it could mean that you've made your qualifications too narrow. If you sell yourself as just an iOS developer then people expect that you can only do iOS development.

EDIT

I'm also curious why you mention Ivy league education. This doesn't matter after your first one or two jobs.