ESOUI - UI Window isn't movable

I created an additional UI label as an extension to an existing addon but I want to be able to drag to move it into a new position on the screen. It's a simple text label but I can't figure out what I'm doing wrong here.

I'm defining the label like this:

Lua Code:

AsylumNotifier.Jump = WINDOW_MANAGER:CreateTopLevelWindow("JumpNofifier");
    AsylumNotifier.Jump:SetAnchor(TOPLEFT, GuiRoot, TOPLEFT, AsylumNotifier.vars.jump_left, AsylumNotifier.vars.jump_top);
    AsylumNotifier.Jump:SetClampedToScreen(true);
    AsylumNotifier.Jump:SetMouseEnabled(true);
    AsylumNotifier.Jump:SetMovable(true);
    AsylumNotifier.Jump:SetHandler("OnMoveStop", AsylumNotifier.OnJumpMoveStop);
    AsylumNotifier.Jump.label = WINDOW_MANAGER:CreateControl(nil, AsylumNotifier.Jump, CT_LABEL);
    AsylumNotifier.Jump.label:SetDimensions(400, 40);
    AsylumNotifier.Jump.label:SetAnchor(TOPLEFT, AsylumNotifier.Jump, TOPLEFT, 0, 0);
    AsylumNotifier.Jump.label:SetFont('$(BOLD_FONT)|$(KB_48)|soft-shadow-thick');
    AsylumNotifier.Jump.label:SetText('JUMP NOTIFIER');
    AsylumNotifier.Jump.label:SetHidden(true);
    AsylumNotifier.Jump.fragment = ZO_HUDFadeSceneFragment:New(AsylumNotifier.Jump);

Later on in the code this function:

Lua Code:

function AsylumNotifier.OnJumpMoveStop( )
    AsylumNotifier.vars.jump_left = AsylumNotifier.Jump:GetLeft();
    AsylumNotifier.vars.jump_top = AsylumNotifier.Jump:GetTop();
end

I have also tried defining it in the GUI XML but that also didn't work, when I did it like that I used the following code:

Lua Code:

<TopLevelControl name="JumpNotifier" mouseEnabled="true" movable="true" clampedToScreen="true" hidden="true">
            <OnMoveStop>
                AsylumNotifier.OnJumpMoveStop()
            </OnMoveStop>
 
            <Controls>
                <Label name="$(parent).label" text="JUMP NOTIFIER" horizontalAlignment="LEFT" verticalAlignment="BOTTOM" font="$(BOLD_FONT)|$(KB_48)|soft-shadow-thick">
                    <AnchorFill/>
                </Label>
            </Controls>
        </TopLevelControl>