Calendar synchronization problem

Unfortunatelly you ignored the support template you removed while typing in your posting above.

I will try to guess, what you did not communicate with us:

  1. Nextcloud Android app 3.30.7 is buggy, so install 3.30.5 from F-Droid
  2. In normal cases Letsencrypt should be installed on Nextcloud server for access from internet. If you want to use Nextcloud from internal network only, you will have to assign a static IP address to Nextcloud server and add this IP address to config.php
  3. To syncronize calendar and contacts you will need the app DavX5 from Google Play store. While configuring it, take care to mark “Do not validate certificate” or similar.
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