Importing Notes - owner not updating

Importing Notes - owner not updating

I am importing Notes from our internal database as a Csv File via the account + notes button.  The note is imported ok against the correct account with a title but i have also matched owner against the email address of the staff member who created the note but all the notes imported are showing against myself rather than the owner.
Any ideas why this is?   ( I actually wanted to import them via the migration tool or API however  I have learned the CRM does not allow me to edit dates or owners via this method, ideally i want to put a historical date against the note aswell.)
CSV Example:
AccountNumber,Title,Owner,Content,Date (although cant import this)
12345,This Is A Title,This Is The Note,crmowner@work.com,'01/02/2020' (this is ignored)