There was an issue with a unusual spike in volume on one of our servers yesterday evening that did lead to the notification reappearing. This only lasted for a short amount of time, and fix has been put in place this morning to prevent this happening for a prolonged period of time. I have just checked and I can’t replicate the error here and all looks to be working fine. One possible reason could be if they are using a private browsing window. The opt in works on a cookie which wouldn’t be stored in a private window.