We have a private collection on our website for regular customers. The regular customers are tagged with “vip”. Providing they have logged in, they can access our private collection.
Does this functionality work on an older theme in preview mode? (that will tell you if changes to a new theme caused the problem)
Does it function for certain users, or no users
Those checks should help you narrow down the problem (and hopefully solve it). If you can’t figure it out and would like a professional Shopify developer to take a look, reach out to my team at speedboostr.com/contact. We work on Shopify sites and apps every day.
Wow! I had exactly the same problems for a looonnng time now. Shopify automatically changes my tags to lowercase starting with a capital letter. So I just changed it to that in my code after reading your comment and I am absolutely happy now. Thanks for sharing this information.