There is a Skype icon in the bar at the top of my Outlook page (outlook.office.com). When I click on the icon I get a pane on the right side of the page that says: Skype for Business. We couldn't sign you in. Please try to sign in again or refresh the page. No matter what I try, I cannot login. Lync for Mac 2011 is the worst IM client I have.
- Skype For Business Mac We Couldn 27t Sign You Into Something
- Skype For Business Mac We Couldn 27t Sign You Into One
See Explore Skype for Business or Join a Skype for Business meeting. Sign in on your PC Click the Sign In button. Type in your password. Side-by-side installation of Skype for Business and Lync is not supported on Mac. We recommend that you perform a clean uninstall of Lync for Mac 2011 prior to installing Skype for Business. Cannot sign in to Skype for Business. Some Lync profiles might be different from Skype for Business on Mac profiles and can cause a discrepancy.
Skype For Business Mac We Couldn 27t Sign You Into Something
Procedure
Skype For Business Mac We Couldn 27t Sign You Into One

- If you do need to restart it, the PowerShell command is Restart-WebAppPool -Name LyncIntManagement. One last note, before you start this process, make sure that the account you are using to attempt to sign into Office 365 actually exists in Office 365 and has the appropriate Global Admin permissions. Lucas Guth, PEI.
- You need a sign-in address and password from an organization that has a Skype for Business or Lync license. If you’re already using Skype for Business on your desktop, then you can sign in with the credentials from your work or school account. How do I reset my password?
The Office 365 DNS setup must be completed. A valid Skype for Business license muste be assigned in the Office 365 Admin Portal and the latest version of Skype for Business should be installed.
- Make sure that your computer clock is set to the correct time because Skype uses a timestamp as part of the authentication process. If the time is more than 5 minutes off, you will not be able to sign-in and should correct the time and try to sign-in again.
- Next try the Office 365 Skype setup for manual configuration:
- Click the Settings icon in the upper-right, Tools, then Options.
- Click Personal and the Advanced button.
- Enter sipdir.online.lync.com:443 as the Internal and External server under Manual configuration.
- Click OK twice and try to sign-in again.

If the above fails, then follow the steps below:

- Exit the Skype client completely. Ensure that it is not still running in the system tray.
- Open an administrative command prompt, type the following, and hit enter: ipconfig /flushdns.
- Locate and delete all folders under: %LOCALAPPDATA%MicrosoftOffice16.0Lync
- Make sure that you can successfully connect to the Web-Ticket service by navigating to: https://webdir.online.lync.com/WebTicket/WebTicketService.svc/mex
If the URL above connects successfully and a page loads, then the Web Ticket service is running properly and there are no connectivity issues. - Try to delete/renew the user’s SIP certificate.
- Open the Certificate Manager by going to Start > Run and typing certmgr.msc
- Expand Personal > Certificates
- Sort by the Issued By column and look for a certificate issued by Communications Server.
- Delete the certificate.
- Remove User's URI
- Open Regedit and navigate to the following path and delete the folder: HKEY_CURRENT_USERSoftwareMicrosoftSharedUcClient.
- Navigate to HKEY_CURRENT_USERSoftwareMicrosoftOffice. Then open 15.0 or 16.0 depending on your version of office.
- Find the key for Lync and open it.
- Delete the Data for the strings named ServerSipUri and ServerUsername.
Try to sign into Skype for Business again. If none of this helps, contact your administrator to open a case with Microsoft.
