AirPods Pro purchased from Verizon but unable to activate Apple Care Plus

https://www.apple.com/uk/support/products/headphones/

You can buy Apple Care+ for your Airpods by going into Store or contacting support where they'll do a check on your Airpods.

You will need proof of purchase as evidence of when you bought your Airpods.

If you are receiving a message that they are not eligible, wait 48 hours from time of purchase and try again.

It sometimes takes awhile for the Apple servers to register the sale.

At least it did for my Apple TV.