Mac OS Sierra Notes App on Mac not syncing to iCloud and/or iOS 10

I recently updated my MBP to Mac OS Sierra as I read that the desktop notes app will no longer sync to iOS 10 without the Mac OS update.

My MBP has updated to Sierra no problems, everything seems to be functioning via iCloud, with the exception of my notes app - my iOS devices my iPad mini and my iPhone SE the notes are syncing fine - changes I make on my iPhone are visible on my iPad. However any changes I make on my MBP are not shown in iCloud (log on via web browser) or in my notes app on my iPhone or iPad.

My iCloud account settings on my MBP and iOS devices are set-up to sync via iCloud.

Please help, it's really annoying to have to email my notes to myself to add them manually to iOS... 😕