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Whether an ASIN or ISBN is found in the backend Amazon database that WDC connects to for creating links and product reviews is entirely up to Amazon. WDC has no control over what's in that database and what isn't.
The My In Print function works when the ID number is in the database.
If your book was released recently, you might have better luck a bit later, after Amazon next updates their backend database.
Also note the error message text in "Product review errors" for another possible reason.
Hope that helps.