Do you have multiple players on the same console? Make sure the VIP benefits weren’t assigned to the wrong GamerTag - XBox Customer Service should be able to help.
A VIP pass is required for each player to receive VIP benefits - but you can’t add them all at once. This solution is verified to work in Forza Motorsport 5 (click page icon next to username to see original post)
You can contact Xbox Customer Support (http://support.xbox.com) if this workaround locks your account due to the “This is not my home XBox” limit of 3 changes per year. Oddly, I couldn’t get the Xbox Support site to complete service request using Explorer or Firefox on my desktop computer, but the site connected fine from my smartphone.