If you get this error when trying to play For Honor, try the following steps in this order:
• Perform a power cycle.
• Sign in to your Xbox.
• Sign in to your Xbox.
• Scroll left on the Home screen to open the guide.
• Select Settings > All Settings.
• Under Privacy & online safety, select Xbox Live privacy.
• Select the Adult Defaults option.
If you need any further help, please don't hesitate to get in touch.