When a user installs or updates an AR Required app, the Google Play Store indicates that Google Play Services for AR is required, and automatically either installs it if it’s not installed or updates it if it’s out of date
App – Google Play Services for AR unlocks Augmented reality(AR) experiences Built using ARcore What Android phones support view in your space for Google 3D Animals.
You have not updated the Google Play services for AR app or the device memory is full. Many times, not having the latest update of an app installed can cause issues while logging in and also while using the app.