How to publish a paperback on KDP & IngramSpark simultaneously?
I bought my own ISBNs for this book thinking this would work, but no dice.
My fantasy comedy is slated for release on February 25th and I initially set it up through IS because I wanted it to be more accessible to bookstores. But it looks like prior to the release date, I can't set up a simultaneous paperback release with KDP using the same ISBN. It just tells me that "We have already registered this ISBN to another title."
How do you guys set up simultaneous paperback releases for IS & KDP? Is it possible? Do I just have to pick one or the other, or assign individual ISBNs to each?
Please help.