We've created this Forum Thread with some workarounds and advice to assist you in publishing you ebook.
When does Lulu assign an ISBN?
I see that, where applicable, Lulu will assign an ISBN and automatically put it on a cover that is designed using the Cover Designer feature. However, it is also necessary to include the ISBN on the copyright page in the interior content. This sounds like a cart-and-horse issue.
Do I use the Cover Designer to get an ISBN and then go back and update my copyright page before uploading the interior content? Or is there a way to get the Lulu-assigned ISBN at an earlier stage in the process?