Solving an Outlook.com and Outlook Authentication Problem

I’ve been trying off and on for some time now to add my Outlook.com account which I use for personal email to Outlook 2013 so that I can see both my personal and professional calendars side-by-side in Outlook. I’ve used this set up for years but recently it stopped working. Every time I tried to add it Outlook would return an error.
Log onto Exchange ActiveSync mail server (EAS): The username or password you entered isn't working. Please try typing them...
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