Using remote play, can I watch Netflix at one house and remote play an Xbox game at another...

You can configure a Logitech Harmony 650 remote (and likely any of the other Harmony remotes) to control the XBox One. I use mine at home to control mine for watching Netflix, Hulu, Blu-Ray disks, etc.

I agree with this suggestion. Or atleast have a dedicated "button" that I could program in my remote to switch to live TV full-screen. I use a Harmony remote and would love to program something into the remote to put the XBox One in TV mode when I press
the "Watch TV" button on my remote and have the XBox One goto the dashboard when I press the "Play Games" button on my remote.

I am confused, is there another way to use wifi remote play than the xbox app?

I use the xbox app on every device for remote play. (Xbox to tablet/PC)

I have the same problem with Netflix and the media remote. The only buttons that still work are the Xbox home key, and the Play/Pause key. Media remote buttons work fine navigating the Xbox menu so I know it works fine but when using Netflix I cannot FF,
rewind, skip, select, etc. This started happening after the November update. If I uninstall Netflix app and reinstall it the remote will work fine until I power off the console at night. The next day when I use power up and use Netflix the remote is back to
not working again. I use energy-save power settings.

Hello, STMALO. Thanks for reaching out. I'm an Independent Advisor and Microsoft Xbox user. I'll be glad to help you out.

I don't think there's a way to play from multiple devices at the same time. You can take a look at Xbox Remote Play but you play only on one device at a time.

About Xbox Remote Play:
https://www.xbox.com/en-US/consoles/remote-play

Here is a guide on how to set up Xbox Remote Play:
https://support.xbox.com/en-US/help/games-apps/...

You can also play using Game Pass Ultimate from 2 devices at the same time (two computers, or one Xbox and one computer), but there are some games available only on PC and others only on Xbox.