Hello there,
Realize this topic is a couple months old but I am having the same issues listed above. Does this issue still persist? I can't seem to buy or miss any items even using custom lists. Not receiving any notifications at all. Everything else seems to run smoothly and it shows shop stock, etc. I just upgraded my membership after a couple years off and never had issues before. Maybe a warning should be added to the advanced membership purchase page that the product does not work as intended? Find it odd that I cannot find many threads on this issue.