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Same error for me guys, I have a fully functionally PWA (https://lattesplayer.web.app), I tried to generate a build for the App Store with PWA Builder, but when I will start the app on a virtual device or on my iPhone, the app performance will drop a lot, and the interactive response will be very slow, and the error came up!
MusicPlayer[297:4753] [ProcessSuspension] 0x10e4dca80 - ProcessAssertion: Failed to acquire RBS MediaPlayback assertion 'WebKit Media Playback' for process with PID 297, error: Error Domain=RBSAssertionErrorDomain Code=3 "Required client entitlement is missing" UserInfo={RBSAssertionAttribute=<RBSDomainAttribute| domain:"com.apple.webkit" name:"MediaPlayback" sourceEnvironment:"(null)">, NSLocalizedFailureReason=Required client entitlement is missing}
Please help!