Well, after much demand Microsoft finally listened and realized that this was a pain and put a permanent solution in place. Besides, something like this should simply work without having to manually update links into a browser right?

This isn’t the ideal solution for users because it can be confusing. If you can’t even hit the page your corporate web filtering may need to whitelist the domain, you are trying to reach. If you are still having trouble your system maybe blocked from installing plugins and you may need elevated rights to do so. NOTE: Follow your browser’s instructions for installing the Skype for Business Web App Plug-in, which is required for audio, video, and screen sharing.

Users can manually add a hyperlink in the meeting invite that includes the ?sl=1 or follow the instructions below: By instructing users on how to add ?sl=1 at the end of the meeting url users can use the web application to join Skype meetings. To help prevent this or mitigate the connection issue, you can provide your users with the “trick”.