To work around this behavior, site administrators can manually add users to the Enterprise Search Center. To do this, follow these steps:
- Sign in to the Enterprise Search Center as the tenant administrator. The URL of the Enterprise Search Center is https://TenantName/Search.
- Click Site Actions, and then click Site Settings.
- On the Site Settings page, click Site permissions.
- On the Site Permissions page, click Grant Permissions, and then follow these steps:
- In the Select Users area, add the All Users (membership) group to the Users/Groups box.
- In the Grant Permissions area, click Add users to a SharePoint group, and then select Visitors (Read) in the Grant Permissions box.
- In the Send E-Mail area, optionally, click to clear the Send welcome email to the new user's check box.
- Click OK.