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When you try to click the Join Online Meeting link in a meeting invitation, you receive the error 'Meeting URL is not valid'. When 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. When Skype for Business Online tries to start an online meeting, the client program freezes. When you try to click the Join Online Meeting link in a meeting invitation in Skype for Business Online, you receive 'Page not found' or 'Page cannot be displayed' in Microsoft Internet Explorer. Then, you can troubleshoot the issue by following the steps that are outlined here. 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. Once the process is complete, quit Terminal.Type or paste this command and press Return:.Once the progress bar is complete, open Terminal, located in the Utilities folder of your Applications folder.You’ll find a progress bar at the top of the window.
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Select Apply to enclosed items, and click OK to confirm. Click the Action menu located in the bottom corner of the window.If the Lock button at the bottom of the window reflects a closed lock icon, click the lock.Click the triangle icon to open the Sharing & Permissions section at the bottom of the window if it isn’t open yet.Choose File > Get Info to open an Info window for your home folder.You can also attempt to repair any permission issue in the failing user’s account home folder.