hi, I can fix this within 1 hour, thus, my hourly rate USD$35. (note: USD)
I have been rejected by Apple with exactly this issue. It can be due to
1. at submission you incorrectly ticked the wrong idfa box
2. you indeed use idfa, but code level make no such use
3. external library not being called correctly.
I will need source code (for code-level inspection) and your itunesconnect access (for resubmission to apple). See if you are happy with this. I can get this fixed within 1 hour.
This is my reinclinated freelancer account, since my previous scriptlance account was somehow deleted by scriptlance.
If you need more information, feel free to ask.
cheers,
Dan