Join Skype Meeting links no longer work with my Skype for Business

I have Skype for Business on Windows 7. For a long time I've always been able to click these "Join Skype Meeting" links in e-mails and calendar appointments from co-workers.

Starting last week these quit working for me. No changes have been made to my Skype or Outlook/Office. It keeps directing me to some Microsoft/Skype webpage that wants me to download the meetings plugin. I already had that, but I tried re-installing it several times to no avail.

I can still join meetings if someone directly adds me or if I click the button in "Join Lync Meeting" button in Outlook (which is weird because neither I nor anyone else is still using Lync... we upgraded to Skype for Business a year ago). The "Join Online Meeting" button also does not work.

Solution 1:

Apparently it has something to do with NPAPI. The quick fix is to change the default browser to IE. There is a longer fix that lets you keep your regular browser. Here is info from MicroSoft on the matter.

https://support.microsoft.com/en-us/help/3057679/lync-or-skype-for-business-client-does-not-start-when-you-click-a-meet