Google has made a small but important change to Google Maps, no longer allowing you to book a ride sharing service like Lyft or Uber directly from within the app. The change appears to be recent and is reflected in the support pages for the feature. Now, instead of being able to book from within Google Maps, you have a link to go to the ride share apps from the providers.
The feature got a lot of hype when it was launched early last year and a way to prevent users from having to move around from app-to-app to book a car to pick them up. You could also see ride share options to a destination you picked in Maps, such as a restaurant, from your location.