Workaround Add following sites into your Trusted Sites list and restart the session.
If adding these sites doesn’t solve the problem, please turn on Protected Mode for Trusted sites.
Yammer App for SharePoint: Blank dialog box pops-up on login when using Internet Explorer
Having *.yammer.com and *.sharepoint.com (like your SharePoint domain) in the Intranet Zone setting in Internet Explorer prevents you from logging into the Yammer from the Yammer App for SharePoint. You’ll see a blank dialog box after logging into Yammer from the app.
Workaround Add following sites into your Trusted Sites list and restart the session.
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