TikTok's browser can't directly open the App Store on iPhone.
Once you've opened it in Safari, the "Get in App Store" button will work.

CTO at Molly - technology & growth-driven leader with +10 years of experience building data and cloud-borne products, optimizing user value and lowering CAC through scalable solutions.
Mads Kessel is CTO at Molly, where he drives the technical strategy for a fast-growing consumer app that helps users save money and shop online with confidence. With more than 15 years of experience in software development, data analytics and digital product management, Mads has led the development of scalable microservices, real-time user insights and automated decision engines. He combines technical depth with business understanding and has previously led cross-functional agile teams with a focus on speed, quality and user-centered innovation. In his current role, he works closely with marketing, growth and product teams to leverage the Molly platform's data to optimize user experiences and drive sustainable growth. In his spare time, he participates in tech meetups, mentors startup founders and explores new technologies like machine learning and serverless architecture.