Workflow lock/ unlock steps not working in AEM 6.3

After upgrading to AEM 6.3, the Lock Payload Process [1] and Unlock Payload Process [2] workflow steps no longer work.

[1] com.day.cq.workflow.impl.process.LockProcess
[2] com.day.cq.workflow.impl.process.UnlockProcess

AEM 6.3

To apply configurations to allow the Lock/ Unlock processes to function in AEM 6.3, follow these steps:

Go to http://host:port/system/console/configMgr.

Find Day CQ Workflow Service.

Mark Enable Lock/Unlock Process to true.

Click Save.

Find Adobe Granite Repository Service User Configuration, and add a new configuration.

Set Simple Subject Population to true.

Set Service Users to workflow-process-service.

Click Save.

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