In my case the Mac is not on the domain, thus I am going to install the certs locally on the Mac later when I get into work.

For those that don't have the latest CU installed then the manual mobility URL should work - folks may need to install the skype for business web services cert locally and the root chain cert though for this to work Look at the local pool fqdn on port 5061). Using the manual configuration with the url format for mobility however in my opinion based on Microsoft's blurb will not work if you have the latest Nov 2016 Cumulative Update - with this update is it the case the Mac client will be treated as a desktopĬlient hence in my case (Nov 2016 CU installed) mobility is not a requirement, I have tried using the correct mobility url but it will not sign-in, however if mobility is not required then the automatic discovery (autodiscover checked) should work (which will No have no issue in saving the correct autodiscover url in manual configuration.