You can use the following steps to check the registry: You can visit: " https://www.finetechweb.com/post/skype-meeting-button-always-gets-disab… " for detailed information:
Exit Outlook if it is running.
Press the Windows function key, search for "regedit," and then click OK.
In Registry Editor, locate the following subkey:
In the details pane, double-click LoadBehavior. If the value in the Value data box is not 3, change it to 3 and then click OK.
Exit Registry Editor.