Game Streaming - Controller Firmware Update?

Have you tried updating the controllers firmware under - Settings - Devices and streaming - Accessories

When you test(on console) streaming ability, it DOES mention when it tests controller that some buttons may not work, and that a controller firmware update is on way to fix it

You may have to double check to see if your controllers need a firmware update. Go to Settings -> Devices & streaming -> Accessories (or open the Xbox Accessories app on your console), then see if there's a firmware update for your controller. Click on
the three dots on the screen, and that should tell you if there's an update available.

Kindly check if there is an update for your controller.

1. Press the Xbox button to open the guide, select Profile & system > Settings > Devices & streaming > Accessories, and then select the controller you want to update.

2. On the Xbox Wireless Controller screen, select “…” to check the firmware version for your controller.

3. If it says “Update,” select Firmware version, and then follow the steps provided.

It sounds like you need to update the firmware for the controller.

If you need to verify the firmware version for your controller or manually restart a controller update:

1. Press the Xbox button
    to open the guide.
2. Under System, select Settings.
3. Under Devices & streaming, select
   Accessories.
4. On the Xbox Wireless Controller screen, select “…” to check the firmware version for your controller.
5. If it says there’s no update available, your controller is current. If it says “Update,” follow the steps provided.