I'm unsure if this is a AVFoundation or Networking related
This is definitely AVFoundation related, and I’ve moved your thread to a topic area where you’re more likely to encounter folks who are experienced with it.
Share and Enjoy
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware
let myEmail = "eskimo" + "1" + "@apple.com"
Just to add further information: it also happened to a customer in NZ with the carrier Spark, and it solved by itself after being connected to wifi for a while. It's a mistery.
Just to get back with the answer for future people with the same problem. The application has a setting that allows users to block cellular access. The block is done via the AVURLAssetAllowsCellularAccessKey option of AVURLAsset initialization.
The error "CoreMediaErrorDomain error -17760 - File exceeds max size allowed over cellular" is the error the system returns when a AVPlayer with as asset loaded with this option tries to play the resource via cellular. The error don't seem especially well worded, but is my fault to not identify it.