Hi Phyl75,
TMobile routers by default have WPA3 security enabled by default. The G4210 is not compatible with WPA3.
Please contact TMobile support and have them disable WPA3 and enable WPA2. Once WPA2 is enabled, you will be able to connect.
To connect your PIXMA G4210 to your Wi-FI, please try the Manual Connect method. Those steps can be viewed here:
Manual Setup to Wireless Network - G4210
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