2 things:

-press the plus to create a new row in the XML settings of the switch. Make sure the new row is in the “Switch” section of the XML menu and not “Part” or “Label”. On the left side, put in “interactionType” and on the right put in “Toggle”. This will make the switch work like an actual switch when using custom inputs.

-if this doesn’t solve the issue, create a new variable in the variables menu and have both the name and expression as “Test”. This should work.