Problem
This problem can occur if you use the SharePoint Online Connector for a SharePoint Online (Office 365) tenant together with Internet Explorer.
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The login prompt in the SharePoint web part is displayed again and again (if you click on Refresh) although you are sure to be you are already logged in to Confluence (in the same browser window):
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The login prompt in the Confluence macro is displayed (although you are sure to be you are already logged in to SharePoint Online in the same browser window). If you click on Login, a popup with a redirect to Confluence is shown, but the authorization doesn't seem to work and the dialog is empty:
Image 2: Empty redirect popup from Confluence macro (click to enlarge)
After closing the empty popup dialog, the login prompt in the Confluence macro is still displayed:
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Most likely this problem is caused by a misconfiguration an incorrect configuration of security zones in your Internet Explorer. For a detailed explanation see O365 Internet Explorer Protected Mode and security zones.
To solve the problem correct the security zones configuration in Internet Explorer:
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Add at least the following domains to the same security zone in Internet Explorer (preferably "Trusted Sites"):
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