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