I am working on enhancing user engagement on our Dynamics 365 portal by implementing a custom subscription and notification system. The goal is to allow registered users to select their favorite topics and receive automated email updates. For instance, we have a large group of sports fans who want to track the upcoming fih men's hockey world cup 2026 schedule and get alerts for match days. What is the most efficient way to capture these specific user preferences on the portal and trigger Power Automate workflows to send out the notifications? Any tips on optimizing this process would be great!