Instead, it opens a landing page of trending collections.
I also tried to open this link in a different browser, and it seemed to work the first time, but not the second time. So if you’re going to test this, please open it at least twice.
Someone helped me out a bit and turned the links into ones pointing to the US site. On the US site, the links do correctly go to my collection. Even the one with my referral code added.
Referrals seem to work on products with a NL domain for me. I think it might be an issue with the collection functionality of Zazzle + different domains.
For example, I also can’t make an RSS feed with a NL domain, it only works with US. Which probably means that they’ve implemented this functionality for US domains, but not for others.
But collections should definitely be available for all domains…