There is an article in Microsoft docs on how to set up the Custom Error page for the Power Apps portal. You can read about enabling here: https://docs.microsoft.com/en-us/powerapps/maker/portals/admin/view-portal-error-log#enable-custom-error And about setting up your custom design here: https://docs.microsoft.com/en-us/powerapps/maker/portals/admin/view-portal-error-log#display-a-custom-error-message The requirement: set up a Custom Error page for the Power Apps portal. Easy! First, you go and…