Error: iCloud Photo Library will begin syncing when this device has finished restoring from backup.
I used iCloud Photo Library in the past, back when it was in beta, but stopped because I didn't have enough storage space on my iCloud account at the time. Since the new storage plans are out, I decided to retry it.
Now, when I attempt to turn it on on my iPhone, I receive the following error:
"iCloud Photo Library will begin syncing when this device has finished restoring from backup."
I haven't restored my iPhone since probably late July and the restore is definitely finished. My iPhone has been making new backups since, and nothing is left to be downloaded.
I've tried numerous things, (turning it off and on again, signing out of iCloud and back in) including a solution which worked previously under iOS 8.
iCloud Photo Library doesn't sync - iCloud restore in progress
Any ideas on how to get around this error on iOS 9?
iPhone 6 Plus, iOS 9.0.1