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Sorry to hear you’re facing problems 
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Nextcloud version (eg, 20.0.5): 28.0.4 (Docker Nextcloud All-in-One), for a home use.
The issue you are facing:
If I created an event in the Calendar (v.4.6.7) via Nextcloud - web, the attendees do receive an email notification. Also for updates or deleting.
If I created an event in a third party app (in my case I use Simple Calendar Pro from Simplemobiletools.com, via Caldav) with my Nextcloud’s user, email notification doesn’t work. However, if I update or delete the event in my phone, attendees receive a notification by email.
Is this the first time you’ve seen this error? (Y/N): Yes. I have an older version of Nextcloud (¿25?) and it works properly. After a complete new instalation, the problem.
Steps to replicate it:
- Install Docker Nextcloud-aio
- Install Calendar, Notifications and “Notifications for Calendar” apps.
- Install a calendar for mobilephone and a syncing app (DAVx5) and create a new event in calendar
The output of your Nextcloud log in Admin > Logging:
[https://pastebin.com/qmG5naZ0](https://pastebin.com/qmG5naZ0)
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
(I have not found)
The output of your Apache/nginx/system log in /var/log/____:
[https://pastebin.com/usqbmGLs](https://pastebin.com/usqbmGLs)