Thanks for confirming, @CarlieEG .
Is it only on certain browsers and mail providers that you’re seeing that blue unsubscribe button link?
Some mail providers, like Outlook for example, give users the option to use a dark mode when viewing their emails. At times, this can impact on the colour of your email texts and/or buttons, and the system may adapt it automatically for readability purposes.
If you’d like our team to take a closer look at this matter from our end, you can contact our Live Support team by logging in to your store via the Help Center here. Once logged in, select a topic that best fits your query or situation. From there, you’ll be taken to a page with a list of relevant support articles, and you can scroll to the bottom of that page to select your preferred contact method with our team. We can then securely access your store to investigate the situation in more detail.