If you are successful connecting your other devices, but can't get to the Epson, try this with the T-Mobile app.

Create a new network with a different name (SSID) than your main network. Make the frequency 2.4 MHz only and choose WPA/WPA2 for the WPA version. Make sure the printer is using DHCP as its method of obtaining an IP address, then try and connect to the new WiFi network you've created.

The problem is that sometimes devices don't have a network adapter that can read the most current technology. Using a more basic set of parameters usually solves the problem!

You can use the app to set the security to WPA/WPA2 and separate the 2.4GHz and 5GHz channels.

Thanks. I created the 2.4 with WPA/WPA2 and all works great now.