Mobile event invitations

Looking for help. When I accept a calendar invite in the eM Client desktop application, it correctly appears in my calendar. However, if I accept the same invite in my eM Client Android app, it fails to display or register. I currently have one calendar installed, and it functions properly when accepting invites in the eM Client desktop.

How can I ensure that accepting invites in the Android app results in them being correctly integrated into my primary calendar? I am utilizing IMAP settings.