The nina module provides a couple of [error codes](https://github.com/arduino/nina-fw/blob/master/main/CommandHandler.cpp#L1384-L1390) which are returned via [WiFiNINA](https://github.com/arduino-libraries/WiFiNINA/blob/master/src/WiFiStorage.h#L61). It would make sense to have them available via [OTAError](https://github.com/arduino-libraries/ArduinoIoTCloud/blob/bfaa7c6bb93bded0810d56e8318db5a65ee3cead/src/utility/ota/OTA.h#L44) as well.