reference url in notifications does not show server's fully qualified domain name

reference url in notifications does not show server's fully qualified domain name

Hello,
Please assist how can i make the email notification's parameter ($RequestLink) show the server fqdn?

Our SDP is installed in centos machine (joined to domain with DNS records) and i have changed host name to server's fqdn (helpdesk.domain.local) 
But when we receive  any notification the click for details info only shows: "Click for details: https://heldpesk:443xxxxx" 


Thank you assistance,
Vanessa

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