TikTok SharePlay Button Is Missing

My phone is updated to the latest ios(15.4.1) and tiktok is also updated to the latest version(24.0.0) but the SharePlay button on the for you page is not showing up as an option when I’m on FaceTime. It does on my iPad, but not my iPhone. How can I fix this? I also can not SharePlay the TikTok’s to my iPhone, it gives me the option and I can receive the invitation to join the SharePlay on my iPhone but it will not do anything. SharePlay has worked on the other apps that allow it.