Clear Sky Challenging Mode still missing.
Maintenance begun around 12 AM PST and will have lasted for roughly three hours (it should be over by the time you read this). The main goal of the update is to fix a bug which prevented daily High Value Target missions from resetting properly but other fixes include those for a bug that allowed players to skip parts of the Clear Sky Incursion, Mobile Cover being used to glitch through walls in some instances, the final cutscene triggering after finishing the Incursion and so on.
Unfortunately, the fix did not deploy Challenging Mode for Clear Sky, which still doesn’t have an ETA for release. Massive have corrected double UI bug across all platforms though. Stay tuned for more information on Clear Sky’s Challenging Mode in the coming days.