AuthRequired: This error occurs when the website has HTTP authentication in place and the website can be accessed only when the username/password for that authentication is provided.
1. Log into your dashboard.
2. Select the site that has the issue to view the Site Details page.
3. In the left navigation bar, click on the hamburger menu to open a list of site settings.
4. Click on Password Protection which will open the below box:
5. Enter the HTTP username & password used to access the website. Click on SAVE.
6. Head back to the Site Details page & click on Sync Now to test the connection and start the sync for the site.