The Kindle version was up and running relatively quickly, with the first ISBN that I provided on the uploaded file, but it took several weeks for IngramSpark, the service I use for distributing my e-book, to get the iBooks, Nook, and Kobo versions out there. To say that they gave me fits, with no real explanation for the errors, would be an understatement. It's like they hate talking to you on the phone, so email messages (or Facebook threads) are the only option. For someone as impatient as me, it was quite a challenge. Just tell me what the heck is wrong, for the sake of cheese and crackers.
Finally, I reached out to one of my e-book designers, and she shed some light on what seems to be my issue.
I was REALLY dreading the thought of using a different ISBN for each format, so I'm glad it finally worked itself out. I mean, yeah. One day, I just got a message from IngramSpark telling me that my other ebook formats were complete and ready for downloading. God bless. But it is whatever it is. It's a lesson worth learning.
And being a subject matter expert on this business means learning lessons as I go. I have to make my mistakes and learn my lessons on my own work, first. That way, when I publish other authors, things will go smoothly.
More to come on this, later, I'm sure. I just hope I don't have these same glitches and challenges with future projects. Woohoo!