Authentification for trainers failed

[old_skool_kicks]

I sold a pair and the authentification failed, i cant understand why? What happpens now? Could they have failed because i marked them with UV pen?

Any help will be highly appreciated

[plum993]

The buyer will be refunded and the trainers must be taken out of circulation.

Info here,Authenticity Guarantee for Sneakers | eBay.co.uk