I cannot synchronise iBooks
I have two Macs (MacBook 15,6 pro early 2016 and MacBook 12 2017) and one iPhone 6s, and iBooks stopped synchronise between them. I tried a lot but I failed... For a moment looked like it was resolved, I removed ebooks and put them back, but next day there were the same problem and the solution above didn't work.
MacBook Pro with Retina display, iOS 11.2.6