If your Sims appear busy in the Sim Tracker without any whistle or work icons, send them to work via the Occupations tab.
What can be done?
Open the Occupations tab, which is the brief case icon on the bottom right-hand corner of the screen. Send the broken Sim to work. You can either cancel the shift or wait for it to complete from there to resolve the issue.
If this did not resolve your issue, please contact Support.