Maintenance for the week of April 6:
• ESO Store and Account System for maintenance – April 8, 9:00AM EDT (13:00 UTC) - 6:00PM EDT (22:00 UTC)
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When the daily quest is the same that you had you cannot repeat it
So it looks like that when you have a daily quest in your journal from another day and you finish it and go to turn it in and the quest giver has the same quest that day for you, you cannot repeat it.
I took a pledge last week and yesterday tryed to do it twice and did not work, it also happens with dailies like delves but i did not get what it was that sometimes if you finished yesterdays quest it did not give you a new one but I guess is the same.