I went through the various steps to set up my mailboxes along with aliases, and properly set up my primary address.

I've got a primary and secondary domain attached, with proper selection on which aliases which. Set up mailboxes and applied the aliases to those (to make sure the default domain is what it goes with in various scenarios).

From what I can tell, it all looks correctly configured in the control panel.

But when I go into either the mobile app, or the web UI, the primary email address shows up as an account id @zohomail.com (formatted like #############_#########@zohomail.com). This is the address it shows as the account in the account dropdown selector in the mobile app, as well as in the "From" address when I start a new email from the web UI.

While I can change this on the web ui at least (no way to change it on the mobile app), this is a nuisance to say the least, and I would much prefer that "behind the scenes" alias to not show.