If users have a Yammer account, but can't log in to on their device, they may need to update Android WebView.
If the above step didn't work, look into these potential issues, or contact your IT administrator or Yammer Support:
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An external certificate that is not yet valid
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An external certificate that has expired
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An external certificate that doesn't have a private key
Note: These three issues are related to the Web Application Proxy (WAP). For more information about WAP, see Web Application Proxy.
