Steps to reproduce :

Secure the connection using TLS v1.2 between the Delivery Controller (XenDesktop 7.9) and the Licensing server (version 11.14) 
referring  https://support.citrix.com/article/CTX200265 Below is the error we get 

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This is a known bug, the issue was introduced after we published the docs for the XenDesktop version, hence to fix the problem try the following :

With XenDesktop 7.9 +TLSv1 works however +TLSv1.1 and +TLSv1.2 fail, So inorder to use later TLs versions we need to upgrade the Xendesktop version to 7.11 or above and License server to 11.14 or above.

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Problem Cause

Known bug with product