vigoroushello Welcome to FlyerTalk and especially the easyJet branch.

I had exactly this same issue trying to sign my wife up 18 months ago. I was unsuccessful and we gave up. You might have better luck phoning easyJet and see what workaround might be available to you. Please do report back with your success story or otherwise. If you have no joy we might find sone kind soul here may know a solution 👍🏻