Correct @ericodapro , you will have to cancel that label and generate a new one, selecting QR code before purchase. I believe it's a "sticky" setting so you should check it before you buy your next label.
While eBay does offer the dual-printable label + QR code option through some versions, it's not accessible through all versions between website, app, mobile web.
To void a shipping label purchased through eBay, go to this page, find the order and select Cancel from the Actions drop-down. The cancel option is available for 28 days.
It takes between 2-4 weeks to receive a refund on an unused, voided label as the carrier wants to make sure the label isn't used. You'll see the refund on your original source of payment (eBay funds, bank, credit card, etc) and the funds will appear in your account without an email notification.
