LYNC 2010 - prompt for credential retrieving respone groups.

Hi All,

I have just setup LYNC 2010 in a test lab and after signing in on the Lync Client it thena few seconds later prompts again with the following;

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Lync - Service Sign in
Credentials are required - Type your user name and password to connect for retrieving response groups.
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When I try to enter the credentials agian it does not like it. Then if I cancel twice the prompt goes and everything seems ok.

Any idea why I get this second login prompt?

Thanks

ECL