I can't get source (my outlook account) to authenticate my username/password

I can't get source (my outlook account) to authenticate my username/password

I'm trying to migrate my email from my outlook account. When I go to add the account for migration, I enter my outlook username and password for source, and then my name@mydomain.com as destination. The error message I get is that the source will not authenticate my username and password. I KNOW I'm entering the right info. What am I missing here?