My app, based on the Leave Request sample gallery app, allows end users to make requests that are written to a OneDrive-stored Excel file. Everything works fine when running the app within the edit window, and it also works when running the published app from the PowerApps Windows application. But I've posted the app to a SharePoint page, and it now won't complete the end user's submission of the request - I can get to the "submitting your request..." screen, but it gets no further. Any suggestions? I have full rights to the app, the OneDrive Excel file, and the SharePoint page.
