notes.app sync issues since iPadOS

This turned out working for me, for now: https://discussions.apple.com/thread/7720480?page=4

Finally found a solution for this after months of trying various different things. (Tried pretty much every solution, individually or in combination). What finally worked for me was:

Making sure that all internet accounts had synching off for notes (including iCloud) in the system preferences

Going to /users/[name]/Library and doing a search within that folder for any file containing “Notes” in the name.

matches were found in both /users/[yourname]/Library/Containers AND /users/[yourname]/Library/GroupContainers

going to /Library/Caches and selecting all and moving to trash

Selected all such files, threw them in the trash.

Empty trash

Reboot

Open Notes

Turn on synching for iCloud

Presto! It worked! For the first time since I installed Sierra pretty much, it finally worked on my computer again! So I’m not sure which file it was exactly that I deleted that did the trick, but my best guess is that deleting the notes related files in “containers” is not enough, you must also go after the related files in “group containers”.

There we go! Hope this helps somebody else!

I am having to same issue, only my notes will not sync between my iPhone and iPad. Running iOS 13.2 and iPadOS 13.2. Sometimes even when I go to icloud.com and create a note it takes a while to show up or does not show up at all on my other devices.