sending from alias address (123@outlook.com) recipient get's from main address (ABC@hotmail.com). need emails showing from my alias address?

problem, sending from alias email address (123@outlook.com) and recipient get’s email from main email address (ABC@hotmail.com). How do i make emails show up to recipient coming from my alias address?! Please be specific with all instruction, don’t assume i know anything. Thx

screen shots above show my issue. need to correct please. Thanks

Hello Tim,
unfortunately this is a known issue we can not do anything about it. Outlook does not support the use of Aliases from external Mail Clients, only from it’s webmail.

Regards,
Olivia

Same Problem here, bad so emclient is useless to us…
senders email address ist shown like outlook_4474364874@outlook.com instead of name@company.com (this is the primary alias in outlook.com)