Migrating email from outlook.com

Migrating email from outlook.com

I am currently using custom domains at Outlook.com and i am considering moving over to zoho since they've stop supporting it. I am trying to migrate email from outlook.com but i kept on getting error message saying " Authentication details provided was rejected by Source server.  " I am sure the server and password information i provided is correct but i just can't figure out why it's giving me this error.