I recently pulled out my older HDHR-T1-US and attempted to connect it to my Roku Streaming Stick. The app complains about not finding my HDHomerun device on the network, and I get a Brightscript error. The same device connects and works well with my Google TV setup, as well as other methods (Windows PC, Jellyfin Live TV setup, etc).
Screenshots of the error are shown below.
Roku Streaming Stick
Model: 3820R2
Firmware: 14.6
HDHomeRun
Model: HDHR-T1-US
Frimware: 20230505
