This server is not RHEL based

Issue

While activating CentOS 7 ELS, using: https://docs.tuxcare.com/els-for-os/ 

we see the following message:

# This server is not RHEL based

Environment

• CloudLinux 7
• CentOS 7 ELS

Solution

Either switch to CentOS 7 and activate CentOS 7 ELS key or continue using CloudLinux 7 which is, currently, did not require extra steps to activate ELS subscription.

Cause

The server is running CloudLinux, not CentOS 7

Useful links

• CloudLinux OS End-of-Life (EOL) details. 
• Will the CloudLinux 7 get Extended Lifecycle Support?
• How to activate CentOS 7 ELS with an activation key?