You have configured the Web dispatcher for the Fiori application, you can open the Fiori My Inbox application with the Web dispatcher domain. However when you press the "Open Task" button, it opens SAPGUI for HTML or other handler with the real backend domain rather than the Web dispatcher domain. You can refer to this solution to change the domain.
SAP NetWeaver 7.4 or Higher
My Inbox, Fiori, Open task, Web dispatcher, domain, URL, generation, how to, SWPA, SWFVISU , KBA , CA-INB-FIO , Fiori UI for My Inbox Application , CA-UI2-INT-BE , SAP Fiori Launchpad services (ABAP) , How To
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