Add Alias support
The web based outlook.com and the windows version of outlook 2019 and 365 both support alias support. Only the mac version does not support this. It would be very useful if such support was added.
It is unbelievable that such a basic feature is still missing (not only for the "new Outlook" but also for all previous versions!
I dislike the need to must setup multiple "real" accounts and the need to configure these for all email addresses "aliases" that do use the same mail account. When there could be a setting to simply add aliasses (like send on behalf of) which is supported by all email clients for macOS I'm aware of and jut a second of work instead of several minutes on Outlook. I do have (unfortunately) up to 10 alias addresses per account and multiple accounts which would lead into having easily 50 or accounts to be configured - that is why I do not use Outlook on Mac for those accounts where I really need aliasses.
Thomas Roy commented
When you add a Microsoft or Outlook.com account, all of the alises should be automatically available from the From menu and a default alias should be set-able in preferences.