Go to http://host:port/system/console/configMgr.
Workflow lock/ unlock steps not working in AEM 6.3
Last updated on May 16, 2021 06:00:36 PM GMT
After upgrading to AEM 6.3, the Lock Payload Process  and Unlock Payload Process  workflow steps no longer work.
To apply configurations to allow the Lock/ Unlock processes to function in AEM 6.3, follow these steps:
Find Day CQ Workflow Service.
Mark Enable Lock/Unlock Process to true.
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.