Where is the $changelink variable getting its value?

Where is the $changelink variable getting its value?

In automation - notification rule -> Change we have an email template that gets sent when a change role is assigned.  In the template there is a variable $ChangeLink that provides a URL for users to click on that takes them to the service desk login.  This URL is incorrect and I'm not really sure where it's pulling it from.  Was wondering if anyone might can point me in a direction to look at where it's getting this value.  

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