Skype for business mac verifying certificate check your clock settings

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If you used the graphical wizard to generate your private key and CSR, you will need to complete the install with it. To install your certificate whose private key and CSR were generated on it, you will need to import your PKCS#7 (.p7b) file, available in your delivery email or from your certificate status page. Install a certificate on Skype for Business Server 2015 (Formerly Lync) Preparing the install