managing phone partnerships in Outlook

I had to get my iPhone replaced twice in the last 5 days.  The second time I received an email from Outlook stating I have to delete a phone partnership by going into the Outlook Web App.  I’ve never had an account nor do I know where to look in order to log in and do this.  I currently cannot sync the email associated with my Outlook on my Mac with my phone and am unable to get emails.  How can I solve this?  Thank you.