Xfinity Speedtest No Longer Works

https://speedtest.xfinity.com/ no longer runs an Internet speed test. Instead, it tells me to "Test your internet speed with the Xfinity app". But I cannot find a speed test option in the app. Where is the speed test in the Xfinity app? Note that I am using a retail modem and router instead of a Comcast/Xfinity gateway. The app is running on a Motorola phone with Android v14.

Where is the speed test?

ETA: Found it, sort of. Selecting "Wifi" and then "Troubleshoot" opens a window where the only speed test option is "Test speed to this device". Here's the fun part: selecting "Test speed" opens a window that says "Test your internet speed with the Xfinity app", you know, the app that I'm in at that moment? If I'm foolish enough to tap the "Test in app" on that screen, all that happens is an all-grey screen is displayed, top to bottom, left to right, and that's all folks! 

This is NOT an improvement in speed testing!