I removed the outlook.com account from Outlook 2016 and then re-added it as an exchange activesync account instead. After going to account settings and clicking "new", choose "Manual setup or additional account types". Then choose Exchange ActiveSync and click Next. For the mail server, enter...
I have this same issue. I use Outlook 2016 with my Outlook.com email address. The "strange" address created is the only send from option I have. Also, people cannot reply to that address. They get an error that it does not exist. This did not used to be this way.
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