Installing Lync 2013 Server or Skype for Business – Getting error “Warning: Request-CSCertificate failed”

When deploying Skype for Business / Lync server in my lab, i got an error “Warning: Request-CSCertificate failed” in the step where we have to request for a certificate.

Login to Certificate Authority (CA) Server :

To troubleshoot and resolve the issue, I simply logged into my CA server and made the following changes:

• Login to Windows CA Server
• Go to Run and type “certsrv.msc”
• Right Click CA server and click on Properties
• Click on Security tab
• Select the Username that you are using while installing the Lync Server. I was using Administrator in my lab server and hence i selected Domain\Administrator 
• Checkbox “Request Certificates” and click on Apply and OK.
• Re-run the “Request” certificate wizard and the issue should be resolved.

That’s all, i hope this helps!