Alias Addresses in Outlook

Hello,

I'm currently testing ZxMobile with Zimbra 8.6.

In my Zimbra Account I set some Aliases and some Personalities which I use to send E-Mails from.
I'm managing multiple E-Mailaddresses over a single Zimbra Account.

When I login to Outlook Mobile on Android I can only send mails from my primary Zimbra Account Address.
No Aliases are detected.

When I login to Outlook 2016 on a Windows PC I can only send mails from the E-Mailaddress I setup.
Also no Aliases detected.

Aren't the Aliases and Personalities which I setup in Zimbra offered to the Client?
Without this the plugin is useless for me.

Thanks for your Help!