How To Add An App For SharePoint Modern Authorization

To perform administrative tasks, you will need to access the SharePoint environment through the following your organization's admin URL, usually: https://{organization}-admin.sharepoint.com.

Begin the configuration of SharePoint using the SharePoint PowerShell client. Establish a connection to SharePoint by employing the command Connect-SPOService with the provided URL.

Enable Custom App Authentication by executing the command:

 set-spotenant -DisableCustomAppAuthentication $false. 

Once SharePoint is configured, proceed to add an app registration. Navigate to the App registration site using the path /_layouts/15/AppRegNew.aspx.

After successfully registering the app, make sure to save both the App Id and App Secret. Visit the _layouts/15/AppInv.aspx site and utilize the App Id to retrieve the app details.

Finally, paste the permissions payload for the app. Once the permission are applied, you can trust the app and use the App Id and App Secret in remiCrystal.

<AppPermissionRequests AllowAppOnlyPolicy="true">  
<AppPermissionRequest Scope="http://sharepoint/content/tenant" Right="FullControl" /> 
</AppPermissionRequests>