Ipad recognises Nextcloud calendars, but content does not sync

ℹ️ Support
,
1

My situation:

Nextcloud 32.0.1 but error ocurred also with previous version
PHP version 8.3.8
Distributed server; no access to system setup
SSL provided by Let’s Encrypt
Nextcloud Calendar App version 6.0.2
Sync access through app tokens, as TOTP is active
Log files do NOT seem to contain any reference to this problem.

IPad Pro
IpadOS-version 26.0.1 but error ocurred also with previous version 18

Problem: Ipad native calendar content does not sync with my Nextcloud instance

Dears,

I do not know anymore where to look for a solution. When I add a new Nexcloud Caldav calendar account to Ipad, it does find the (5) calendars I created. However, it does not bring the calendar’s entry’s. It mentions that the certificate is not trusted… (?).
I have tried to connect to
https://www.mynextcloud.domainname (as per instructions on Synchronizing with iOS — Nextcloud latest User Manual latest documentation ). → Result, as above
https://www.mynextcloud.domainname/remote.php/dav Indeed, this does not work.
https://www.mynextcloud.domainname/remote.php/dav/principals/users/Eric/ (as per instructions within the Nextcloud Calendar App) → Result, as above

When I use another IPad calendar app, ‘OneCalendar’, it gives me no problems and transfers all calendars and their respective content from my Nextcloud, and syncs correctly. When adding a calendar account in this app, one of the choices is Nextcloud (not just ‘Caldav’). I conclude that the certificate is not the problem then…

The curious thing is that the IPad Calendar App does find the calendars, but not what’s in them…

Any suggestions for a solution are imensely appreciated!

Eric

2

Is it from letsencrypt. You can check the whole certificate chain and the webserver config from outside with: SSL Server Test (Powered by Qualys SSL Labs)

For iOS (and many other OS), they rely on the service discovery:

If you create a new event, you can normally choose in which calendar you want to put it, then you should obviously choose the Nextcloud calendar that you synced.