If you already installed the agent, but can't see the data in the Atatus dashboard for more than 10 minutes, just make sure that license key is correct.
Check license key in the file
/etc/atatus-infra-agent/atatus.yml
license_key: lic_******
If it isn't there or incorrect, copy and paste the infra license key from Atatus Infra settings.
Once it is updated, restart the infra agent.
copysudo service atatus-infra-agent restart # OR sudo systemctl restart atatus-infra-agent