Can Calendar app support several CalDav calendars in parallel?

Question

it seems that calendar app does not support several CalDav syncs in parallel. I have two accounts at the same provider:

1. CalDAV 1 gets recognized as a "cloud" account in the system/online accounts settings. No problem.
2. PROBLEM: CalDAV 2 always results during sync, as attached in the image.

Details:

• While adding CalDAV 2, Calendar app recognizes there are several options (calendars & notes). I tried adding the direct link to the required calendar without success.
• Via the app, I can add new events, but calendar app does not sync exiting events.

Any ideas are welcome. Thanks in advance!