Variable fonts used on web, font-weight property not working

Hello! Using a variable font for the first time on a web project. The font is loading ok on the site, but the "font-weight" property doesn't seem to be working for all the font instances shown in the adobe fonts control panel. I did get this property to work... "font-variation-settings: "wght" 150;", so I'm not completely in the dark, but seems like the normal font-weight property should work as well. Maybe I'm missing something in the settings? The font I'm using is Mozaic Geo Variable. Thanks for any information!