RCS (Chat) on Xfinity Mobile?

Are any Android users successfully using RCS on Xfinity Mobile? It is similar to Apple iMessage except that it uses cellular carrier hubs instead of Apple iCloud. It also works over WiFi for free!

Here is the XM information link: https://www.xfinity.com/support/articles/rich-communication-services-android-faqs

Eventually it will be cross-carrier. I wonder whether XM activation includes Verizon and its other MVNOs?