Thanks, Adjust. I think what happened was that the new 13-digit epub ISBN had not yet been posted to Bowkers, so when iTunes Producer ran a check it naturally came up empty-handed. I tested the premise with an author who had already posted their epub ISBNs to Bowker, and it came back clean, posting to iBooks without a hitch. So now I'm waiting for our newly-posted epub ISBNs to clear Bowker's database and get posted to the public (they say this takes one to three business days).
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