Amex Platinum lounge access when non revving
 

Does anyone have the Platinum card and have you been able to show your non rev boarding pass to get into any lounges?

No. You need a seat assignment to get into the lounge. They are very strict about it.

If you use the Priority Pass which comes with the Platinum card. You can get into some lounge like "The Club" as a non-rev. If you're talking about the Amex Centurion lounge than. you need a seat assignment or boarding group.