Configured CalDav but no device visible

I want to use a caldav calendar sensor instead of the Google calendar I already use.
I’ve set a caldav calendar on my Synology NAS, and tested it with Mozilla Sunbird.

But with the same parameters, seems to not see it.
In configuration.yaml :

  - platform: caldav
    username: !secret caldav_hass_username
    password: !secret caldav_hass_pasword

Is there something I forgot ?

Thank you

I’ve got the same issue…
When manually connecting to my synology, I see that the Synology does not handle displayname…

And hass needs to handle caldav’s with names