I have a Roku 3 that has stopped working as described in the original post with a Harmony Hub as well. It just began not working after working for several years. I also have another Roku 3 and Harmony Hub for a different TV and they are still working. I guess I will not take any updates for that TV/harmony yet. I also have a Roku 2 that works fine.
I tried to add the non-working Roku 3 device (model 4200x) using the Harmony software but the Roku is not detected as being on the same network - it cannot find the Roku. Obviously, it really is on the same network (wired ethernet) but the Roku is not detected by the harmony hub during setup. The other Roku devices in my house are still detected during this step. I also tried connecting the Roku 3 to my wifi instead and it still is not detected. Please fix this issue! I need my directional buttons back!
Same problem here.
I have a Roku 4 (model 4400X) with software version 9.0.0 - build 4084-7.
I'm not sure I understand how you can force the Roku to be added an as IR device...
I just purchased a Roku Streaming Stick+ and found significant delays in remote commands when using the Harmony Remote. Since this device does not use IR, the IR workaround is not relevant.
I called Roku support, and they told me that they do not support or recommend using Harmony Remotes on ANY roku hardware devices, and that they are only compatible/supported/recommended on Roku TVs. They told me that there was no workaround, and that if I use the Harmony Remote there will continue to be a delay and there is no fix coming for this.
Very disappointing news, and I will have to return this device as I'm too invested in the Harmony Remotes at this point to switch to another option. I guess it's back to the FireStick and their annoying Amazon-Focused content. It's too bad, as I really prefer the Roku devices but No Harmony Support is a definite deal breaker.