Thunderbird don't show deck calendar

Hi, I’ve many cards in Deck with a due date, I can see the date in the nextcloud calendar but, when I configure the caldav in thunderbird, the thunderbird’s calendar is empty. how can I see all the due date of the cards in thunderbird calendar?

This feature does not exist. See:

the calendar is not synced but I can see the card in the task folder of thunderbid but is in read mode only, I can’t edit or add any card

Ist that in entirely true?
Because Davx5 (for Android) syncs the deck “calendars” as tasks.

Therefore i would assume that it could be possible to sync the cards as tasks with Thunderbird as well (have not tried it yet).

They still donot show up in the TB calendar though, which i am also trying to achieve…