Lync 2010 and Lync 2013 clients will be compatible with the upgraded server software, but will not provide the same level of functionality as the new clients.This appears to work fine if the Lync servers and user running the script are both. Skype for Business for Mac is the current production client for Mac OS X. ITS recommends upgrading Windows computers to the latest Skype for Business 2016 client for the best user experience.If necessary, you can then follow specific resolution steps based on the type of error. Skype/SIP: user.lastnamemicrosoft.maildomain.comTo troubleshoot Skype for Business Online sign-in errors, start by eliminating the most common causes of sign-in difficulty. You must sign in to both applications using the same account.' Email address: user.lastnamemaildomain.com. Remember that a successful upgrade aligns technical and user readiness, so be sure to leverage our upgrade guidance as you navigate your journey to Teams.One of my MAC users is having an issue that pops a message saying: 'Online Meeting: The Outlook and Skype for Business (Lync) user accounts do not match. If you want to upgrade your organization to Teams yourself, we strongly recommend that you begin planning your upgrade path today. If you haven't upgraded your Skype for Business Online users to Microsoft Teams before that date, they will be automatically scheduled for an assisted upgrade.The table below lists some common causes of sign-in errors and some steps you or the users can take to resolve them. You can try to reinstall Microsoft office 365 Pro.Follow resolution steps for a specific error (Enterprise only)Add a firewall entry for msoidsvc.exe to your proxy serverInstall a third-party SSL certificate on your ADFS serverUse the Microsoft Support troubleshooting guideCollect more information and seek additional help Check for common causes of Skype for Business Online sign-in errorsMost sign-in issues can be traced to a small number of causes, and many of these are easy to correct. Desktop application share.Ask the user to try signing in again.Reset the user's password and notify him or her of the new temporary password.Not licensed to use Skype for Business OnlineConfirm that the user is registered as a Skype for Business Online user. Verify that the user's sign-in name is formatted as follows: This may be different from the format you use to sign in to your organization's network. For details, see Modify TrustModelData registry keys.Mistyped sign-in address, user name, or passwordConfirm that the user's sign-in name and password are correct. Enterprise customers can prevent this message from appearing when a user signs in for the first time by modifying the Windows registry on each user's computer. Ask the user to select the Always trust this server check box, and then click Connect. Connect anyway?Verify that the domain name in the dialog box is a trusted server in your organization—for example, domainName.contoso.com.
For details, see the Microsoft Knowledge Base article 816042, How to configure an authoritative time server in Windows Server.To troubleshoot Skype for Business Online sign-in errors, start by eliminating the most common causes of sign-in difficulty. DNS changes can take up to 72 hours to be reflected throughout the system.System clock out of sync with server clockEnsure that your network domain controller is synchronizing with a reliable external time source. If you have already made the necessary DNS changes, advise the user to try logging in later. Ask users to sign out, click the Delete my sign-in info link on the sign-in screen, and then try again.You set up a custom domain name, and the changes may not have finished propagating through the system.First, ensure that you have modified the Domain Name Service (DNS) records to reflect the change. Ask the user to uninstall and reinstall Skype for Business Online from the Microsoft 365 admin center.Problem acquiring a personal certificate that is required to sign inIf the user's sign-in address has recently changed, they may need to delete cached sign-in data. Download fanco ceiling fan manualFollowing the table are detailed procedures to address each issue. The table below lists the most common error messages and possible causes. If you are an Office 365 Plan P customer, continue to the following section, Collect more information and seek additional help.If the user cannot sign in after you have tried the suggestions in the previous section, then you can do additional troubleshooting based on the type of error. Follow resolution steps for a specific error (Enterprise only)These instructions are intended primarily for Microsoft Office 365 Plan E customers. If the user still cannot sign in, collect additional information, and then seek additional help. Skype For Business Clock Error How To Add TheInstall a third-party SSL certificate on your ADFS serverTo install a third-party SSL certificate on your Active Domain Federation Services (ADFS) server, follow these steps:Obtain an SSL certificate from a third-party certification authority such as VeriSign or Thawte.Install the certificate on your ADFS server by using the ADFS management console.This procedure is a possible fix for the error message Problem acquiring a personal certificate required to sign in.To eliminate possible certificate or credential problems, first renew the user's certificate in Windows Certificate Manager. Update DNS settingsIf your organization has a custom domain, this procedure is a possible fix for the following error message: Server is temporarily unavailable.Contact your domain name registrar for information on how to add the following CNAME record to your domain:Value/Destination: sipdir.online.lync.comFor details, see the Microsoft Knowledge Base article 2566790, Troubleshooting Skype for Business Online DNS configuration issues in Microsoft 365 or Office 365. Under the Tasks tab in the right pane, click Configure Forefront TMG Client Settings.In the Forefront TMG Client Settings dialog box, click New.In the Application Entry Setting dialog box, configure the following rules:For details, see the Microsoft Knowledge Base article 2409256, You cannot connect to Skype for Business Online because an on-premises firewall blocks the connection. If you have a different web gateway solution, use the settings described in step 4 below.To create an application entry for Msoidsvc.exe in Forefront TMG 2010, follow these steps:In the Forefront left pane, click Networking.Click the Network tab. As a result, the msRTCSIP-UserEnabled attribute is still set to FALSE in Active Directory Domain Services.This procedure is a possible fix for the following error message: Sign-in address not found.The following steps assume you are using Microsoft Forefront Threat Management Gateway (TMG) 2010. To do this, follow these steps:Click Start, click Control Panel, and then click Credential Manager.Locate the set of credentials that is used to connect to Skype for Business Online.Expand the set of credentials, and then click Remove from Vault.Sign in again and reenter the user's credentials.Finally, if the user still cannot sign in after you've updated their credentials, try deleting the RSA folder on the user's computer, because it could be blocking completion of the user authentication process:Sign in to the user's computer using an administrator account.If necessary, turn on the folder view option Show hidden files. To do this, click Start, click Run, type certmgr.msc, and then click OK.Double-click Personal, and then double-click Certificates.Sort by the Issued By column, and then look for a certificate that is issued by Communications Server.Right-click the certificate, and then click Delete.Next, if the user is running Windows 7, remove their stored credentials in Windows Credential Manager.
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