Use license on staging or dev sites

Yes, you can use your license on test or staging sites – they do not count against the license limit.

TLDs that are considered as dev or staging:

*.dev
*.dev.cc (DesktopServer)
*.test
*.local
*.staging
*.example
*.invalid
*.myftpupload.com (GoDaddy)
*.cloudwaysapps.com (Cloudways)
*.wpsandbox.pro (WPSandbox)
*.ngrok.io (tunneling)

You can check out more details here:

freemius.com/help/documentation/selling-with-freemius/license-utilization/