My New iPad Air 4

And, to add to the previous contributors, a brand new iPad should come pre-charged, not 100% but rather close. This means that without even charging your device, it should turn on. If not, you should return it.

See this support article:--> If your iPad won't charge - Apple Support

If the issue persists, make an appointment and have your device inspected at an Apple Store or Authorized Service Provider among this list:--> Apple – Location Selector

(bearing in mind that you have 14 days from the date of purchase to return your device asnd ask for a refund).

Regards

Giulio

It came with a cable and a 20 watt charger.

Try using a different outlet.

Use the Get Support link at the top right of this page.

They usually ship with a 50% charge.