Cant add MQTT entity to an area?

Very new to HA. Trying to just figure things out right now. I have added 1 device (SonOff mini flashed w/Tasmato) via MQTT auto-discovery. The switch is added to HA as a MQTT entity and I have it added to my Lovelace UI. When I try to edit the entity, I can not add it to an area (let’s say I want to add it to Kitchen area). How can I add the entity to an area? When I click on it to edit it (both under entities and service) it does not show me an option to add it to an area and when I go to Area, I see my areas but see no way to add devices to those areas. Any help would be appreciated.

Not all entities are supported to be setup in areas, they must be exposed as devices (not entities). This means you can only add devices to areas (you can see your current devices in the settings menu just like you can find entities).

Go to devices. Click on your sonoff. Then click on the cog to add to an area.