Hiding Label based on tag value

Question

I am trying to hide a label based on its value = N/A as passed into the tag.  Does not seem to work any advice?

<Grid>            
<Grid.Resources>
                    
                    <Style TargetType="{x:Type Label}" x:Key="LabelTextStyle">
                        <Style.Triggers>
                            <Trigger Property="Tag" Value="N/A">
                                <Setter Property="Visibility" Value="Hidden"/>
                                <Setter Property="Background" Value="Blue"/>
                                <Setter Property="FontFamily" Value="Trebuchet MS"/>
                                <Setter Property="FontSize" Value="18"/>
                            </Trigger>
                        </Style.Triggers>
                    </Style>
                    </Grid.Resources>

                    <Label Style="{StaticResource LabelTextStyle}" FontSize="14" Tag="{Binding Path=lblCOO}" FontWeight="Bold" Foreground="#FFF9F7F7" Margin="23,9,59,36" Name="lblCOO" Grid.Column="3" Grid.Row="1"></Label>
                </Grid>