Cleanings show as Unassigned. Nobody has been given the job yet. Open Housekeeping Schedule, click the day, and pick a cleaner under Housekeeping Incharge (see Members).
No cleaning was created after a checkout. Check the property's cleaning settings: the schedule (for example After Guest Checkout) on the Properties page (⋯ → Cleaning Settings) and the room's Cleaning Settings under Rooms & Rates. Add the missing one with Manual Cleaning in the meantime.
A cleaning has been "ongoing" for days. The cleaner probably didn't finish it in the Elev8 Go app. Open View Progress to see which steps are left, then Contact the cleaner.
A team member doesn't see a task. Check who it's assigned to. A task assigned to a role only reaches people who have that role on that listing.
A recurring task stopped appearing. Open Task Scheduler and check it's still there, with the right listings and role.