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The issue you are facing:
Steps to replicate it:
- Connect a Nextcloud calendar to MacOS or iOS calendar
- Create an event with an attendee
- See no invitation email being sent
When creating an identical event in the same calendar directly on Nextcloud, the invitation is sent as expected. However, even there a simple Accept in the RSVP bar in Outlook/Gmail does not report back to Nextcloud that the event has been accepted.
SMTP is setup as it should be.
Anyone any ideas?