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There is no one definitive answer to this question, as there could be a variety of reasons why the Android notification setFullScreenIntent functionality might fail to work on specific Samsung and Oppo devices. Some potential factors that could contribute to this issue might include compatibility issues between the devices' hardware and software and the specific version of the Android operating system being used, compatibility issues between the notification system and app or service that is attempting to display the full-screen notification, or bugs or other technical issues with the devices' firmware or software that interfere with the functioning of the notification system. Ultimately, determining the precise cause of this issue would likely require a thorough diagnostic investigation by a qualified software engineer or developer with expertise in Android app development and mobile device compatibility.