Hi @Fly1992
Thank you for posting your questions in the community and great question. I do believe you will need a link in the button in order for the functionality you are seeking to work. In this case, since the button is for someone to stay opted in, I would recommend the button link back to your website, maybe a new products or services page, or a custom LP that thanks for them staying opted in and showcasing the newest items.
How is the conditional split configured? If you are looking to split based on a URL click, then you will definitely need a URL.
Alternatively, you could use the button click to save a profile property. This again, I believe you need to have a URL in the code for it to redirect and save the profile property correctly, but you could use the appended profile property as the condition for the split in the flow.
Please let me know if you have any other questions!
Best,
@In the Inbox