Well, it migth still be tied with the Trials of the Gods "Weekly Community's Challenge" still wasn't beaten[www.ubisoft.com] upon Assassin's Creed: Origins tab inside Ubi' Con[ubisoftconnect.com] and you should continue to defeat the Gods in rotation to further contribute towards getting that "Weekly Challenge"'s parameters met.

Im having a similar issue, the past 2 days completing the Daily Quest has provided no reward. Though buying a Heka Chest still gives an item so the functionality is still there, something is just buggy.

And if none of your issues is currently solved and knowing my usual posture around the still currently low ethical standards held by Ubi$oft... then I humbly suggest you to open a Ticket upon the Ubi$oft's "Support" site[www.ubisoft.com] so that those might eventually get fixed upon a timely manner.

As you full well know by now, Ubi$oft will only move their @r5es if pressured enough and knowing that not solving their games' issues might give them an even worst public image than they currently have, thus lowering their already low stocks value upon the trading markets[www.reuters.com] and by explaining you how their current and basic "modus operandi" is still working... so, do the logical Math'.

Got a reward from the daily quest today, but i also made sure to check the Helix store before accepting the quest to make sure i was connected to the ubi servers. I guess you could try that during the next Trial of the gods to make sure its not a server connectivity issue