Howdy y’all. Not sure why I said “y’all” but it’s Friday and I’m in a good mood. 
Anyway.

On October 1st Microsoft released a Cumulative Update for Skype for Business Server that fixes several issues most notably this dreaded iOS9 meeting join issue. The short form is that lets say you are on iOS9 and open a meeting link from an email message or calendar entry. Click link, mobile safari spawns and this should then launch Lync or Skype for Business mobile and take you to the meeting. However, the bug just launches safari and that’s all. No conference for you. I hate the browser to Lync launch on iOS process by the way as it always hijacks your device if the last thing you did was join a meeting. I digress. 

If your organization allows EWS externally (and oh so many still don’t which is evil evil evil) the other proposed workaround was to use the ‘Join Meeting’ button from within the mobile client calendar node. Of course if you can’t hit EWS this will be empty if you hadn’t synced previously. 

So what are you waiting for? Update now now now. 

KB article covering the iOS 9 bug. It says Lync 2013 but I have seen this against Skype for Business Server as well. 

https://support.microsoft.com/en-us/kb/3097592

Also there’s a link to a cute little workaround site which I didn’t notice before. 

https://az361881.vo.msecnd.net/sfb/index.html
KB article covering all the fixes. 
https://support.microsoft.com/en-us/kb/3061064
Link to download Skype for Business Cumulative installer:

http://www.microsoft.com/en-us/download/details.aspx?id=47690