Users cannot sign in connected with wifi at home

Hey
I need some urgent help with that issue:
My clients report that they can't sign in to Lync app when they conneted to
WiFi at home
when they are trying to connect Lync through 3G or 4G with "auto detect server" - it does works great!
I don't really know why it happens but I guess it is someting with DNS maybe?
please note that it happen only with iOS devices
Thanks!

Clients sign in using DNS so the first thing to check is if the clients are correctly able to resolve lyncdiscover.contosso.com. Also check 3G\4G to compare DNS resolving to correct\expected IP's
You haven't mentioned if its the same device they are using or what version of Lync we are talking about here. Also, do you have a mobile APN for your organization? If so the 3G\4G could be considered as on the WAN.
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