Unemployed duplicant still requiring high morale

Solution 1:

Yes, it is permanent.

• Morale will replace Food and Decor Expectations. As Duplicants gain training, you'll have to improve the colony around them
  • Added Morale modifiers for using recreation buildings, proper bathrooms/mess halls/bedrooms, and food eaten
  • New tiers of rooms added
  • Massage Table is now a medical/stress item rather than a recreation item

The important bit to note here is the 'gain training'. This means that when a Duplicant masters a job or gets trained in an advanced job, it will modify their expectations about the colony. You can see this in the Duplicant details panel.

Reference, expressive update patch notes.

Your best bet to solve the problem would be to improve the decor scores in your colony, and improve the quality of the food you are providing.