With the many different types of endpoints and network configurations that organizations use, there can be different ways that users connect to their Skype for Business environment, and as such, different sources of issues when connecting. Microsoft has developed detailed instructions for IT administrators to diagnose the issues and fix the problems based on the root causes. Below are the instructions provided by Microsoft:

Aditya is a self-motivated information technology professional and has been a technology writer for the last 7 years. He covers Internet services, mobile, Windows, software, and How-to guides. The Get-CsClientCertificate cmdlet provides a way for administrators to retrieve information about the Skype for Business Server client certificates that have been issued to their users. This information includes both the date and time that the certificate was issued in addition to the date and time when the certificate will expire. Below is the list of versions that will work with Skype for Business Online: Skype for Business Click-to-Run - Requires the April 2018 Updates: Monthly and Semi-Annual Targeted – 16.0.9126.2152 and higher; Semi-Annual and Deferred Channel – 16.0.8431.2242 and higher; Skype for Business 2019 volume license; Skype for Business 2016 Desktop.

Scoping the problem

Let’s assume that you want to troubleshoot issues that occur when users try to join a Skype for Business Online (formerly Lync Online) meeting by using Lync 2010, Lync 2013, the Lync for Windows Store app, or Lync for Mac 2011. Before you start, ask yourself and any external users who are experiencing the issue the following questions:

Tags: Cannot sign in to Skype for Business because your computer clock is not set correctly, skype set the correct date and time on your device to sign in to skype, skype for business clock error, cannot sign into lync because your computer clock is not set correctly, skype set the correct date and time on your device to sign in to skype, skype. Skype for Business in Office 2016 keeps asking for credentials Skype for Business will open and login but then a window asking for credentials will pop up even though I'm already logged in. When I enter my credentials and click 'save my credentials', Skype for Business crashes.

How many users does the problem affect?
Are the users internal or external to your organization?
Can the affected users reproduce the problem on a single computer or on multiple computers?

When you have the answers to these questions, see the following table to determine the kind of issue that you’re dealing with. This table is provided to help scope the problem to a certain category. However, some categories may be outside the technical support boundaries of a Skype for Business Online support engineer.

Read the table as in the following example: Multiple users… (but not a single user) …from outside our organization…Can’t join a Skype for Business Online meeting from multiple computers: (is usually caused by) Lync federation issue or external network issue.

Be aware that each column and each row are mutually exclusive. That is, the issue affects either a single user or multiple users, and the issue can be reproduced either on one computer or on multiple computers.

A single user…A single user…A single user…Multiple users…Multiple users…from inside our organizationfrom outside our organizationfrom inside our organizationfrom outside our organizationfrom both inside and outside our organizationCan’t join a Skype for Business Online meeting from a single computerClient issueClient issueClient issueClient issueClient issueCan’t join a Skype for Business Online meeting from multiple computersUser identity issue or provisioning issueLync federation issue or external network issueNetwork issue or Service outageLync federation issue or external network issueService outage or network issue

PROBLEM

Note Most of the issues can be resolved by following the Lync Meeting join guided walkthrough and troubleshooter that’s at the following Microsoft website:

The Lync Meeting join guided walkthrough and troubleshooter

If you don’t experience one of the symptoms that are listed in the following table, use the scoping table in the “Scope” section to narrow the problem to a specific kind of issue. Then, you can troubleshoot the issue by following the steps that are outlined here.

SymptomCategoryTroubleshootingWhen you try to click the Join Online Meeting link in a meeting invitation in Skype for Business Online, you receive one of the following error messages in Microsoft Internet Explorer:Network connectivityTroubleshoot network issues

Page not foundPage cannot be displayedWhen Skype for Business Online tries to start an online meeting, the client program freezes.Client issueTroubleshoot client issuesWhen you try to click the Join Online Meeting link in a meeting invitation, you are repeatedly presented with a security warning and can’t join the meeting.Client issueTroubleshoot client issuesWhen you try to click the Join Online Meeting link in a meeting invitation, you receive the following message:User Identity or Provisioning IssueTroubleshoot identity issuesError: Meeting URL is not valid.When you use Skype for Business Online to join a Lync conference that is organized by another company, you receive the following error message:Lync Federation issueMake sure that Domain Federation or External Communications are configured correctly Skype for business mac date time certificate error

Skype for business mac date time certificate error

reference ID 43 (source ID 241)When you click the Join Online Meeting link in a meeting invitation, a File Open dialog box appears. Additionally, Skype for Business Online doesn’t start the online meeting.Incorrect file associationFixing OCSMEET file associations in WindowsYou tried all steps in this document and still can’t join the Skype for Business Online meeting. You are determined to connect to the conference, even if you can’t participate in audio, video, or chat.Not applicableJoin meetings by using the Lync Web App

Troubleshooting Windows client issues

To resolve any client or computer issue, first make sure that the computer is up to date. The computer should have the latest operating system updates, audio and video drivers, and software application updates to make connecting to a Skype for Business Online meeting a successful experience. To do this, follow these steps:

Skype for business mac date time certificate error list

Run Win

Skype For Business Mac Date Time Certificate Error