Credentials are required prompt -- won't go away

Hi,
We have several users that are receiving a credentials prompt when signing in to Lync. It is not everyone, and it is not on every machine. For example, I sign in fine on my machine, but on a resource PC I get prompted for cred's. This began
happening about 1 week ago. It won't accept the creds. Also, I cannot erase the box "Account:"
The message: Type your user name and password to connect to the certificate service.
2008 R2 Domain
Lync 2010 FE server
Lync client version 4.0.7577.4446
I checked all the normal things, accounts/PWs, etc. No go.
If I run Certmgr.msc and compare two PCs, the one that works fine has certs issued by "Communications Server" listed under Certificates - current user > Personal > Certificiates. On the machine that prompts for creds there are no certs
there.
Also interesting... If I hold Ctrl and right click icon, to look at configuration information, I see MAPI is working fine on one and Unavailable on the other.
So how do I force lync to issue a cert?
I should mention that for a few weeks we have been attempting to configure a lync edge and reverse proxy server. Neither of those work. The reverse proxy is offline, and didn't affect this issue.
Thanks in advance,
Todd
Todd Wollin

Hi,
As the issue not happen only for several users, it can be a Lync client issue. So you can firstly do the following checkpoints on local computer:
For the issued computers, please check if they have the Root certificate in the local certificate store.
Exist Lync client, then delete Lync user profile and Register information, then rerun Lync client to check the issue again.
Make sure the issued Lync client update to the latest version, and then test again.
Best Regards,
Eason Huang
Eason Huang
TechNet Community Support

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