Add aliases from Outlook online account.
Why can't I use aliases I already have listed in Outlook.com account? This is ridiculous! Agents keep saying should be able to see aliases but then I prove them wrong time after time. Come on Microsoft get off lazy butts and fix this!
Paul Hinton-Hammond commented
essential as currently I only have half an email app. I can read, but if I want to reply I have to log into outlook online