I’m not going to even begin to pretend I know the difference. All I know is in the past there were people who weren’t seeing ads and they were advised to Enable Custom Push Notifications and it solved it for them. So I’ve known it to be a potential resolution.
It’s possible that it’s a bit outdated now, but I believe there’s been positive feedback on enabling options not too long ago. I try my dardnest to watch what people say helps and attempt to comprehend basics, but that’s about all I do. Basically I try to do simple triage and regurgitate solutions that have worked for others. That tends to at least offer more information for those who do know what they are doing to be able to step in rather than coming in with an empty slate.