I want to make a 20 page colouring book, A4, B&W
But it won't let me select the option 'Sell on Lulu, Amazon, Barnes & Noble, and more'
I was just wondering if anyone knew the reason?
As you can see, the A4 size has to have a minimum of 68 pages. Pick another size that allows a lower page count from the above list. Take heed that some are full-colour only.
I'm having this same issue except, my book meets the page requirements, what could the problem be?
You have not said exactly what your problem is. Distribution is also about what is on the pages, not just how many there are.