A Microsoft file hosting and synchronization service.
You were clear - I was referring to this message:
It keeps referring to my pst folder being open in another location.
<<
A pst an Outlook file - and pst files do not sync well. They can take "forever" to sync if very large.
Search OneDrive for pst files - do any have a current date? (It's ok to store pst files in OneDrive as a backup, but you shouldn't open them in outlook. )
If the pst is in OneDrive and open in Outlook, close Outlook on both computers and wait until the old computer stops syncing OneDrive. Make a copy of the pst on both computers - copying it outside of OneDrive and change Outlook's settings to use the copy.