Need help troubleshooting my Ring doorbell

I have a basic Ring doorbell and chime. My wife is a shared user on our account and her Ring functions (live view, motion detect, etc.) recently stopped working on her Samsung J7 phone. I tried everything that I could think of to remedy the problem, and as a last resort I uninstalled the Ring app on her phone, reinstalled it, invited her as a user and she accepted. The problem now is that the motion detect function isn't working on either of our phones. I'd appreciate any guidance.... thanks in advance.