Can't set up scheduled monitoring

**Operating system: Ubuntu
**OS version: 20.04 LTS

Hi there!

I recently wanted to set up monitoring & alerts in case one of the server services stops working. I found out Webmin should be able to do this, but the button “Scheduled monitorin” under Webmin > Tools > System and Server status does absolutely nothing when clicked.

Running latest updates on all packages.

Debug log of Webmin shows no obvious causes to me.