Can’t activate or pair my pencil 2nd Gen

Not on an iPad Air 2nd generation (as indicated on your products list), since it's not compatible with any Apple Pencils.

On other iPads, compatible with Apple Pencil 2nd generation (check this list:--> Apple Pencil compatibility - Apple Support), start reading this support article:--> Connect Apple Pencil with your iPad - Apple Support.

If the issue persists, contact Apple Support directly, using this link:--> https://getsupport.apple.com/?caller=kbase&SG=SG004&category_id=SC0300&symptom_id=23237

Regards

Giulio

What year and model iPad are you using with this 2nd gen Pencil?