I'm trying everything I can to TRY to sync my ibooks to my iphone. I noticed the my main apple account computer is not authorized. I can't authorize it because in the last 30 years I've had many computers and apparently 5 of them are authorized, though long out of use.
At this point, it may be best to un-authorize all of these devices. Then re-sign-in with your Apple ID on the devices you want to be authorized to use your Apple App Store purchases.
Ref:
At this point, it may be best to un-authorize all of these devices. Then re-sign-in with your Apple ID on the devices you want to be authorized to use your Apple App Store purchases.
Ref:
How do I find out which other computers are authorized so I can deauthorize one??
