Looking for logging into the Lync Mac Sign In site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Lync Mac Sign In site. After that you can login as usual with your login credentials.
https://support.office.com/en-us/article/i-can-t-sign-in-to-lync-3cda8a29-2ace-4ae1-ac19-68beec6b8e0d
https://support.office.com/en-us/article/set-up-lync-for-mac-2011-for-office-365-ae3ebd0e-a1a7-48cf-9350-36b144dc5f88
https://support.microsoft.com/en-ae/help/2629861/troubleshoot-sign-in-issues-for-lync-for-mac-2011-in-skype-for-busines
https://social.technet.microsoft.com/Forums/en-US/af021037-54cc-447a-9ff5-0186450fe774/lync-for-mac-2011-will-not-sign-in-on-macos-sierra-public-beta%3Fforum%3DwinRDc
https://answers.microsoft.com/en-us/msoffice/forum/msoffice_sfb-mso_other/lync-2011-unable-to-sign-in-on-mac-os-sierra-1012/55820083-0b21-430a-ac2d-767598f6ee1e%3Fpage%3D2
https://oit.colorado.edu/tutorial/office-365-set-lync-mac
http://www.google.ae/url?url=http://help.utk.edu/kb/index2.php%3Ffunc%3Dshow%26e%3D2459
https://www.youtube.com/watch%3Fv%3DA2up1uG4nYo
https://liberty.service-now.com/ess/kb_view.do%3Fsys_kb_id%3D8f68ebf26906e140f47c0482f91900ae%26sysparm_nameofstack%3D%26sysparm_kb_search_table%3D
http://www.google.ae/url?url=http://communicationsknowledge.blogspot.com/2016/03/how-to-troubleshoot-lync-for-mac-issues.html
http://www.google.ae/url?url=http://lyncinsider.com/skype-for-business/skype-business-mac-client/
https://discussions.apple.com/thread/7691308
https://community.spiceworks.com/topic/1578538-not-able-to-log-into-lync-for-mac-2011