I actually learned this the hard way yesterday..
I was at DFW.. flying domestic to DC for meetings... got to the airport early so thought I'd sit in the lounge... Im flying business class and am a Platinum Pro traveler... I've always been able to access the lounge..
I walked into the lounge, showed the lady my ticket on my phone... and all she said was "are you a member?"
I responded "I have platnium pro status and am flying business class today".. she simply said "if you are not a member you cannot come into the lounge"...
No further explanation.. no further words said.. she just gave me a resting bitch face type stare, expecting me to promptly leave (typical shit AA customer service)...
Granted I havent tried to get into a lounge for a domestic flight in probably 3 or 4 years.. I typically arrive at the airport just early enough to be able to sit down and get a meal somewhere and then have to go board.. so maybe the policy changed a while back? But I thought I remember looking at my app and the benefits of platnium pro as recently as late last year and lounge access was available for all travel with that status?