Exactly same thing as in US topic here:
https://us.forums.blizzard.com/en/wow/t/tbcc-daily-quests-not-resetting-from-previous-day/1247701
Right after the reset (9:00am for me), when i tried to pick up the daily q, I only get the Q item, but the quest itself wasn’t picked. Also the Q log is empty with empty daily counter.
There was also the system message : You have already completed 25 daily quests today.
Restart, relog, delte cache didn’t work.
Edit : after an hour of trying different thing, it fixed itself and the blocking system message disappear after what i pick a daily quest on alt.
So it can be helpful for someone who just trying to find a solution to this.