As with many I have the "sync" (sink?) problem.
In my case I have had sync problem for months in 2024 since at least June.
The recent problem was a few days ago Sept 23rd maybe when my PC failed and I swapped the SSD to a spare PC.
As you may know this takes a few reboots for Windows to readjust to the new hardware but it normally works well.
However in this case all my programs worked but my OneNote entries for the last five years had gone.
(On the 25th I discovered how to access all my data via OneDrive and as far as I can see all is there)
I have not read all this post, in fact when hitting the "Replies (xxx) chevron" all I got was the chevron changing and could not see any of the replies.
Today I simply attempted to post as I am doing now.
All I have tried is the info on syncing by right clicking on the notebook name and then again on "Notebook Sync Status"
This gives me a screen I have accessed many times and shows my unused notebooks (created years ago as tests) all ok
My main notebook comes up with an "incomplete" message. If I look at performance and Ethernet in Task Mangler" I see quite a lot of trafffic but on looking at the local notebook (via the down arrow next to the last page on the right) the number of pages locally has not increased.
If there is another approach to getting it to sync successfully please let me know.
I am now going back to the various hits including this one to see if I can see replies etc.
Regards
PS I don't like this editor.