When you send a Calendar invitation to the primary user email (John Doe - email@example.com), the email alias user (Jane Doe) appears on the Guest List instead of the main user.
- Google Calendar on the web
Google Calendar has machine learning, if the user who invites John Doe frequently contacted or sent Jane Doe emails and invitations in the past, this might be the cause why when the user tries to reach John Doe, the suggestion would always have Jane Doe on the pop up and when the user presses enter, the invitation goes straight to the email alias.
As a workaround, the users on their organization can go to Google Contacts
and delete Jane Doe from their contacts list.
The email alias was a previously deleted user and it exists on their organization's Google Contacts