eBook not showing on all devices

Hi

I have recently downloaded an eBook onto my laptop, but now when I use Adobe Digital Editions on my phone or my tablet that eBook is not showing on either of those two devices. I have authorised my laptop, phone and tablet all with the same Adobe account, but for some reason this eBook is not showing on my phone or my tablet. I have also updated my Adobe Digital Editions on all my devices so that I have the latest version on each device, but this didn't seem to solve the problem. If anyone has any possible suggestions of how I can get the eBook to show on my phone and my tablet I would greatly appreciate any advice.