Hey Siri not working on my iPad Air 2.

Welcome, 1104clipwire!

Thanks for using Apple Support Communities! We understand you're looking for a way to use "Hey Siri" on your iPad.

The iPad Air (2nd generation) does not support "Hey Siri".

For a list of devices that do support this feature: Devices that support "Hey Siri" - Apple Support

All the best.

Thanks for the reply, 1104clipwire!

That's great news!

We hope you have a awesome day.