Here is relevant general information of My Inbox and Workflow relevant for the . 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
2421785 How to Customize the Decision Keys In My Inbox Fiori App
2421360 Action Buttons are not displayed in Fiori My inbox App
2449058 Approve workflow from My Inbox Not Working
To Analyze HCM issues in My Inbox first of all you can user the following tips:
My Inbox: How to check the Targetmappings in the browser
My Inbox: Get information about the tasks