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If you're using Lync 2010, delete the Skype for Business Online personal certificate and then download a new one.

Restart Lync, and then try to sign in to Skype for Business Online.

Delete the folder associated with your sign-in address.

%USERPROFILE%\Local Settings\Application Data\Microsoft\Communicator\ Windows Vista, Windows 7 and Windows 8 (excluding Windows 8 RT):

Locate the local application data folder:.

To delete the endpoint cache, follow these steps: However, sometimes the endpoint can be changed and can cause sign-in to fail. When Lync connects to a specific front-end server, it caches that endpoint to make the sign-in process faster in the future. If the steps earlier in this article don't resolve the issue, try the following methods, as appropriate for your situation: Before you modify it, back up the registry for restoration in case problems occur. Serious problems might occur if you modify the registry incorrectly.

In the Services window, check whether the Status of Microsoft Online Services Sign-in Assistant is listed as Running.Ĭlear your cached certificates, credentials and connections.Īdditional troubleshooting steps for Lync 2013 and Lync 2010įollow the steps in this section carefully.

Right-click the Start button and select Run.

Make sure that Microsoft Online Services Sign-in Assistant is running on Windows Services by following these steps:

Update the Lync client to the latest version that's available on the Downloads page of the Microsoft 365 portal. If you have trouble signing in to Skype for Business Online, click Delete my sign-in information and Lync 2013 will automatically remove any saved password, certificates, and connection settings for the user account. Solution Resolution for Lync 2013 Delete the sign in informationĭuring the sign in process, Lync 2013 caches your credentials and other information about its connection to Skype for Business Online.

Part of the certificate chain is untrusted and the certificate chain fails validation.

The Skype for Business Online personal certificate or the cached credentials are corrupted or are out of date.

The certificates cannot be acquired or validated.

The Microsoft Online Services Sign-In Assistant is out of date.

This issue may occur if one or more of the following conditions are true: There was a problem verifying the certificate from the server.

If the problem continues, please contact your support team.Īdditionally, when you try to sign in to Lync after a network outage or a Skype for Business Online service outage, you receive the following error message: Cannot sign into Lync.

If you run into install or sign-in problems, please contact TDI Computing.When a Microsoft 365 user tries to sign in to Skype for Business Online (formerly Lync Online) by using Lync 2010 or Lync 2013, the user receives the following error message: There was a problem acquiring a personal certificate required to sign in.

SFB will then authenticate and you will be logged into SFB.

At the improve Skype for Business screen, click No.

Password: Enter your NetID/email password and then click Sign-in.

Sign-in address: ( Leave as is) User name: with netid being your own Dartmouth NetID.

Use the following details to fill in the available fields: A new field will appear with the title User name.At this point the authentication will most likely fail.When asked if you would like to save your Skype for Business sign-in info, it is safe to click Yes.Make sure that Save my password is checked or you will need to enter your password at every login. Enter your NetID/email password and then click Sign-in. SFB will connect with the Office365 server and then present you with the password field.

At the sign-in screen, enter with being your own, full Dartmouth email address and then click Sign-In.

If Skype for Business is not installed, download the English installer from Microsoft’s download page: Skype for Business Download (most users should use the 64 bit installer). Windows users with Microsoft Office 2016 installed should already have Skype for Business 2016 installed.

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