OneNote not syncing

I have Office 365 and have that installed on my desktop and laptop computers.
When I make changes to Access databases, Word documents and Excel spreadsheets on my desktop computer and look at them on my laptop they are identical.
However, when I look at my OneNote notebooks the ones on my laptop are not the same as the ones on my desktop.
When I clidk the icon at the top right of the application next to the minimse button I see that the accounts are the same, so both computers ought to be looking at the same file.
I have also updated both OneNote programs to the same version. I am using the latest version of OneNote on both computers.
One difference between the computers is that on my desktop I have the folder C:\Users\abcde\, where abcde is my name, but on the laptop the folder is C:\Users\ms\, which was created a long time ago when I bought Office using the email [email protected].
Can anyone explain how to correct this problem please?
I have thought about uninstalling Office on my laptop, deleting C:\Users\ms\, then reinstalling Office , but am not sure if I would be able to delete that folder, even though I have admin privileges.
My other thought was to try a clean reinstall of Windows on my laptop, but as I cannot remember if it originally had Windows 10 and I used the free upgrade, or had Windows 11 installed I don't know the activation code which might make reinstallation impossible.
Thanks.