Ideally, the employee should do this while he still has the computer in his hands.

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Case no. 1. Ask the employee to log off while the computer is still in their possession

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🔗 Click here for the English version

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If he has already returned the computer, then he can be asked to perform the following manipulation remotely.

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Case no. 2. Ask the employee to deactivate the "Locate" option remotely via iCloud

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🔗 Click here for the English version

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If that didn't work or the person is not available, then you will have to contact Apple.

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Case no. 3. As a last resort, ask for support from Apple

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Request support from Apple by clicking This link.
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You must be the owner of the device. Proof of purchase is required, and should include serial number, IMEI, or MEID.

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🔗 Click here for the English version

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