I've never been rejected with just the *G BP at FRA...
LH lounges at FRA yet again last week rejected my LH boarding pass printed with A3*G status when scanning the boarding pass. It felt like a blast from the past to have to show an A3*G card yet again with LH lounges at FRA. Fortunately, the Apple Wallet digital A3*G card worked at the very same LH lounges’ scanners where my printed boarding pass were rejected.