I've been in the exact same situation for about a week.
But today, something different happened; the diagnostic tool finally returned everything green!
My advanced experience is not working, but here is the catch, only advanced experience works. Any other link, AppClip Code, or QR code that is not registered in Advanced Experiences will not work. I've deleted my Advanced experiences since they were tests, I will report back if everything starts to work as it should.
It looks like Apple is trying to fix it since I have not changed anything.
erickva
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Sorry, I meant to say: "My advanced experience is NOW working".