您好!
请问在登陆失败后,有没有什么报错?请查看下面的文章是否有帮助:
https://support.microsoft.com/zh-cn/kb/3096704
如果还是有问题,建议您尝试删除Lync应用, 并清除所有Lync的相关验证账号缓存,重新在iPhone上安装Lync 2013 for iPhone客户端,尝试进行第一次登陆Lync的配置, 并查看问题是否解决。有关Lync for iPhone配置的详细过程,请参考:
https://support.office.com/zh-cn/article/Lync-2013-for-iPhone-%e5%85%a5%e9%97%a8-6d8d5f99-73a6-404b-9943-dbd549374617?omkt=zh-CN&ui=zh-CN&rs=zh-CN&ad=CN
https://support.office.com/zh-cn/article/%e9%9c%80%e8%a6%81%e5%b8%ae%e5%8a%a9%e7%99%bb%e5%bd%95%e5%88%b0-Skype-for-Business-iOS-%e5%90%97%ef%bc%9f-aa89f3d2-44e7-4d8a-9a26-643fbf5c732b?ui=zh-CN&rs=zh-CN&ad=CN
另外该论坛主要讨论Lync for Windows的相关问题,建议您也可以到Office for iPhone 论坛寻求帮助:
http://answers.microsoft.com/en-us/office/forum/office_mobile-officeapps-os_device_iphone?sort=lastreplydate&dir=desc&tab=threads&status=all&mod=&modAge=&advFil=&postedAfter=&postedBefore=&threadType=all&tm=1468490453795
Regards,
Winnie Liang TechNet Community Support
Please mark the reply as an answer if you find it is helpful.