After an attempt to fix a bug, the developers of The Division have caused a bigger bug that has made some daily missions unplayable for the time being. IGN writes daily hard's and challenging missions will be unavailable until they can be properly patched and fixed on Tuesday.
This means that Daily Hard and Challenging missions will not be available until April 12. We apologize for the inconvenience. 2/2— The Division (@TheDivisionGame) April 10, 2016