Emails for Calendar Events not being Sent for non-Admin users

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Nextcloud version (eg, 20.0.5):
Operating system and version (eg, Ubuntu 20.04): Plesk Obsidian v18.0.51_build1800230404.10 os_Ubuntu 20.04
Apache or nginx version (eg, Apache 2.4.25): replace me
PHP version (eg, 7.4): 8.2.4

The issue you are facing:

Is this the first time you’ve seen this error? (Y/N): Y

Steps to replicate it:

  1. Non Admin user creates calendar event
  2. Invites others from same GROUP to event
  3. No email notification is delivered

NextCloud : on Plesk Obsidian v18.0.51_build1800230404.10 os_Ubuntu 20.04
Calendar app version 4.3.3

Email service is running and test emails are being delivered, but I am unable to get email invites for a calendar event to trigger, unless the calendar belongs to the admin. If it is an admin owned calendar and admin creates event and invites other users, the users are sent email.

If any other user creates a calendar and assigns the calendar to a group, then invites any member of that group to the event, no email is sent.

I have tried a shared calendar with a group - same results.

I have all notifications checked in admin>activity/notifications

I have “send invitations to attendees” and “send notifications for events” enabled in Admin>groupware