You can do it like this:
Restart the game and go to the dungeon. Dungeon first, not anything else like kigdom, guild, soulforge etc.
First, the dungeon screen will be black. Click X and reenter dungeon. Bosses will show and you can battle the 1st one. Game will freeze after the battle but rewards are given although it’s not shown.
Force exit the game and do the same as above. You’ll get to fight 2nd boss. Force exit and go to the 3rd boss. Force exit after game freezes. Start the game again and go to the dungeon -> offer and buy diamonds (if you want). Buy, nothing happens, buy again and the game says you already bought daily offer. After that, YOU’RE DONE WITH DAILY DUNGEON, CONGRATS
Hopefully, this will be fixed as soon as possible.