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See if this helps: community.office365.com/.../16264.aspx or community.office365.com/.../62196.aspx or community.office365.com/.../158201.aspx or community.office365.com/.../19750.aspx
If your problem is still there, then recheck your DNS settings.
Alexandru Dionisie | www.tutorialeoffice.ro | MVP & MCC for Office 365
As a quick solution, I suggest that you can bypass Lync 2010 Autodiscover and DNS resolution.
The Lync 2010 client can be set to use manual configuration to determine whether the sign-in issue is related to DNS resolution issues. If manual configuration works and automatic configuration does not work, it usually indicates a problem with DNS resolution. This usually occurs because the DNS SRV records are not present or are inaccessible from the client computer. To set Lync 2010 to use manual configuration, follow these steps:
1. In the upper-right area of Lync 2010, click the Gear icon to open the Options page.
2. In the Lync - Options dialog box, click Personal.
3. Next to the sign-in address, click Advanced.
4. Make sure that Manual Configuration is selected and that the configuration values are exactly as follows:
Internal server name or IP address: sipdir.online.lync.com:443
External server name or IP address: sipdir.online.lync.com:443
Important If manual configuration works but automatic configuration still fails, the issue is not resolved. Follow the steps in the following article in the Microsoft Knowledge Base to confirm that the correct Autodiscover records exist:
For more information of Lync Online troubleshooting please refer to the article below:
How are the things going?
In addition, do you need further assistance on the issue?
I am having the same issue. I tried to connect manually but it didn't work. Any other advice?
Thank you for your feedback.
Would you try to use the solution overhead and create a new thread for the result?
Yes, the solution did not work for me.
Would you open a new thread for the issue so we can focus on dealing with it?
Try un-assigning the Lync licence in the User Portal, wait 30 mins, then re-assign the Lync licence. This can sometimes help.
Would be great to know if this helps you.