I have connected other email domain to Google account as alias and in EMclient I use only the Gmail address. When I received Teams invitation to alias email address and I answer to this invitation through EMclient (Big green button) it will send answer as Gmail and not as email address where invitation was sent. Is there any possibilities to change this behavior? Like answer in the name of the domain where it was sent or something like that? I also have Teams logged in as this alias in Emclient also this not help. Sound complicated 
I know, but it’s easy, send answer in name of original email which received that invitation (or in name of Teams logged in EM).