Apple Pencil will not pair with my iPad air

Keeping in mind that iPad Air 1st & 2nd generation DO NOT support any Apple pencil, see this support article for compatibility:--> Apple Pencil compatibility - Apple Support

If the compatibility is okay, read this support article:--> Connect Apple Pencil with your iPad – Apple Support

If the issue persists, contact Apple Support directly, using this link:--> Get Support

Regards

Giulio