Variable not working

Hello,
Running Grafana 8.3.0 on Ubuntu Linux
I am trying to pass a variable from one dashboard to another using the var-variable= as stated on the manuals

10.254.109.53:3000/d/eAbkhMh7z/dashboard-cliente?orgId=1&var-sitio=F492BFCCD6CD&fullscreen

But i cannot use the variable “sitio” on the dashboard i have tried $sitio, ${sitio} but the variable is not set on the dashboard.

Thanks for your support