Thank you for reaching out to us through the Xfinity forum. Casting would require an external device like Chromecast or have the casting technology built into the TV and mobile device/application along with a stable Wi-Fi connection. It is also possible to mirror your phone to your TV, which is slightly different to casting, but it also requires that your television be able to support such features.
Had you been able to cast previously from the same phone on the same TV? What I can inform of is that the ability to cast or mirror is a device manufacture feature and not a service from the cellular provider. So far, I have not found any information of LG removing its casting technology from its devices and see that Wi-Fi Direct is the way to screen share from your phone to other devices that support Wi-Fi Direct technology. Let me know of any other questions you may have.
My X Charge will be two years old this month. It doesn't have and never had a screen casting/mirroring function. Wifi Direct and a casting app can't create a function that isn't on the phone to begin with.
so now you have got me confused - this from CNET https://www.cnet.com/how-to/mirror-an-android-device-to-your-tv-using-chromecast/ - "Google built screen mirroring, referred to by Google as Casting, into Android starting with Android 4.4.2 -- which was released back in 2013, so your current Android devices should all have Casting built in and ready to go. At one point, Google was updating a support page with devices that supported the feature, but the company stopped updating it around the time Samsung released the . In other words, if you have an Android device that was built in the last three or four years, you should be fine. " Since the Xcharge came with 7.0, why does it not have google cast or miracast abilities? There is no cast option available to add on this phone. So soemwhere alng the line on thid phone, that ability has been removed from the android OS? Or am I missing something?
Edit - seems I was missing something - casting also requires wireless chipset compatibility - something my now over 6 year old LG G2 had, but appears to not be found in this phone.
On LG's page at https://www.lg.com/us/support/help-library/screen-share-screen-mirroring-device-to-tv-CT10000018-201... it says, "Most LG phones are equipped with screen share and other content sharing technologies. If you are using Android 4.0 and above, the phone may come with a screen share feature." They don't say that all phones have it.
According to Google, it sounds like you need both the Google Home app and Chromecast. They also say not all devices are optimized for screen casting. If you have Chromecast, you could download the Google Home app and see if it works. I don't know whether or not casting with Google is dependent on LG also having casting built into the phone. I would have tried it but I don't have Chromecast.