The new "features" are called:
- identifierForAdvertising (IDFA) which is a cross-app/publisher identifier
- identifierForVendor (IDFV) which is a publisher-specific identifier
In Settings, navigate to General / About / Advertising, then... flip the switch to ON.
This is not listed under Privacy. It is tucked away in an unlikely corner. It is ON by default. And, to turn it OFF, you have to turn it ON. Weird, huh? Smell a rat? ~Kevin