Lync phone show failed to obtain user ceetificate

hd420 show failed to obtian user certificate.
it happen on remote site. so far one site have this problem.
how can i import user certificate manually?
it is on-premise lync 2013 server.
thanks.

Hi Jo Tse,
You cannot manually install certificates on the device.
The CDP (CRL distribution point) will only appear on certificates created AFTER the CDP is defined. This means that if you have issued certificates, you will need to re-issue certificates
to have the CDP available to those computers. There is no way around this.
About how to configure the CDP, you can refer to the following article.
http://blogs.technet.com/b/nexthop/archive/2012/12/17/creating-a-certificate-revocation-list-distribution-point-for-your-internal-certification-authority.aspx
Best regards,
Eric
Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact [email protected]

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    Lync 2013 client until user accounts are migrated to Lync 2013 Server. Manually typing URLs is not an option in a big organization, can't explain thousands of users of different levels what to do.
    We are regretting the decision not to separate Lync 2013 from Office 2013 package we deployed recently. If Lync 2013 is uninstalled then all Lync meeting requests are opened in browser without an issue.

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