Here is relevant general information of My Inbox and Workflow relevant for the HCM Apps. Specific details could be found under each component. Note that not all the applications with an approval process can be integrated in My Inbox. For the integrated applications all the configuration details are in the SAP Help Portal
If you are facing an issue please check the version of the related Software components installed in your environment and look for solutions under the listed related components, Related Components and Software Components
Tips for troubleshooting
To Analyze HCM issues in My Inbox first of all you can use the following tips:
3101192 - Troubleshooting for HCM Fiori Apps integrated in My Inbox
My Inbox: How to check the Targetmappings in the browser
My Inbox: Get information about the tasks
Relevant Notes for My Inbox integration
2938524 Missing functionalities in Approve Leave Request via My Inbox
These notes have solved issues in the HCM applications related to My Inbox and Workflow:
2421785 How to Customize the Decision Keys In My Inbox Fiori App : Note relevant in case the buttons for the actions are available in My Inbox, but no action is done when clicking on the buttons
2421360 Action Buttons are not displayed in Fiori My inbox App
2449058 Approve workflow from My Inbox Not Working
2872952 Work item text are wrongly evaluated : Relevant when the requestor name doesn't appear in the task list