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This is probably what you read:
However, it only applies if the client had initially given feedback that you want retracted.
Thus, since there was no feedback within 14 days after the contract was closed, I don't think it's possible for that anymore.
If a contract was closed, and the 14-day period for providing feedback has passed, you can click a button to enable to add OR change feedback.
You can do this whether there is zero feedback or some feedback there.