The Seamless SharePoint Add-In requires an authentication using the Microsoft Identity platform. The Microsoft Authentication Library (MSAL) enables developers to acquire tokens from the Microsoft identity platform in order to authenticate users and access secured web APIs.
This authentication requires that you
- allow pop-ups from [*.]sharepoint.com
- allow cross-site tracking
If your browser security settings prevent pop-ups and/or cross-site tracking, the sign-in will fail and a corresponding message with a button indicating "Click here to proceed" will be displayed.
|In case of Safari on Mac, clicking the "Click here to proceed" button will not complete the sign-in process and you must allow pop-ups from this page.|
To allow pop-ups navigate to Settings / Safari and disable Block Pop-ups.
After allowing pop-ups in Safari, you will be prompted to open the pop-up. After clicking Allow, you will automatically be navigated to the Seamless page.