I need help opting out the program

Your friend will need to log in and opt out of the preview program on the console.

I opted OUT of the Xbox preview program nearly 6 no that's ago now if that helps

If you decide that you don't want to get Preview updates anymore you can opt out in the Xbox Preview Dashboard app. You won't be removed from the program right away; it won't happen until the current update is released to the general public. If you change
your mind, you can always re-register your console later using the Xbox Preview Dashboard app. There are two ways to go about this:

1)Prior to receiving the New Xbox One Experience Update Preview, take no action -- we'll default you to remaining on the Existing Xbox One Experience preview. You'll still get the benefits of Preview, like Backward Compatibility, but you'll stay on the current
Xbox One update that's available to the public. Later, just before the general release of the New Xbox One Experience, we'll update your console to the latest Preview build, so you'll still get it a little early.

2)In the Registration area of the Xbox Preview Dashboard, you can choose Remove to remove your console from the program entirely. Your console's removal will be processed within 72 hours. If you choose this option after taking the New Xbox One Experience
Preview update, your console will go back to the current general release of the Xbox One software, but this will restore factory defaults on your console, and erase all locally stored accounts, apps, games, saved games, settings, and home Xbox associations.
We encourage all users to download/copy your favorite games to External Hard disks to ensure a quick recovery option in the event of data loss from a removal.

If you are having trouble removing your console from the Preview Program move your post to forums.xbox.com/.../default.aspx

Maybe you can try this to see if you get a response.

I registered to preview the updates, but I don't have access to the private forum. How do I get access?

If you've registered to preview Xbox One updates but still get a “Group Not Found” error when you try to access the private Xbox One Early Access forum, your registration probably hasn't been processed yet. Once it goes through, you should receive access
to the private Xbox Early Access forum within two business days.

If you can't visit any of the forums, make sure you're signing in at Xbox Forums using the Microsoft account that's associated with your gamertag. If you're signed in but still have trouble accessing any of the forums, please contact us on Twitter at @XboxSupport
for help.

twitter.com/XboxSupport