Unable to see connected devices on Home Internet App

Yep. My T-Mobile Home Internet App Device tab says "No devices found" when devices ARE connected and working on WiFi. T-Mobile support says there are known bugs with the app, for at least two different kinds of gateways (Sagemcom and one other). The app also freezes and won't go back to the Home screen. Support says app has this problem until a new update is issued. No estimated time for fix. This problem just started for me yesterday (2/21/24) but has been reported previously by other users. Before this I had a problem with the app not recognizing that some of my devices were in fact connected, but the app said they were "offline." Now it's not finding any devices. Some users on this site said they were told to reboot the gateway, but that didn't work. Any other solutions? By the way, this is a new gateway, three bars, and yes, I spoke with customer support. No solutions offered.