Help & troubleshooting for network issues, including connecting your device to your home Wi-Fi network, connecting to public networks, troubleshooting wireless issues & ethernet connections, and optimizing streaming performance.
I haven's seen one of this mentioned in a long time, but some people have reported an inability to connect if their wifi password contained non-alphanumeric characters.
Roku Community Streaming Expert I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well. If this post solves your problem please help others find this answer by clicking "Accept as Solution.".
Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X
Verify with your neighbor that he does not have Family Mode Enabled or any setting on the network app that may be "Pausing" the connection to his network for the RokuTV.
The fact that you can connect this RokuTV to your wifi, but not his own while others are connecting to same network, seems to indicate that a setting (probably from the mobile app) is blocking connection to the TMobile network.
Roku Community Streaming Expert Just another Roku user... I am not a Roku employee. Insignia RokuTV, Ultra 4660x, Premiere+ 3921, Express 4k+ 3941