OK, I posted my similar problem and just figured it out. I recently added Canada and UK markets to our shop (in addition to US). I discovered that the products I added were EXCLUDED from ALL 3 markets. Once I went into Markets and manually included them for each of the 3 countries they now appear. I copied from another product and it could have been one only sold in the US so that does not explain why US was excluded.
Topic summary
Core Issue:\nUsers are experiencing a problem where newly created active products display \
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