Maybe its the new Player from v9.29+
So please try Version: 9.28.0.3162 from Apkmirror.
com.plexapp.android_9.28.0.3162-868271524_minAPI21(arm64-v8a,armeabi-v7a,x86,x86_64)(nodpi)_apkmirror.com.apk
How your Sonos Arc play DTS-HD?
HRA only works with Shield Update v9.0+