'LayerMask.NameToLayer not returning the expected value

I have the below code:

LayerMask targetLayer;
targetLayer = LayerMask.NameToLayer("TeamB");

However, instead of selecting my named layer, it selects 3 random ones (seemingly)? Default, TransparentFX and Ignore Raycast.

I also tried:

targetLayer = 7;

As I know that is the index of the layer, but it still doesn't work. What am I doing wrong? How do I programatically set my named layer?

c++sharp unity3d

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