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You need to read up on how shape layers work. Masks are not shape paths and vice versa. You simply inserted it in the wrong place.
I have a question. why did you use auto trace if it's text? you can easily create shape from text if you have the font by right clicking the text layer -> create shape from text.
by looking at your screenshots it seems you have copied the mask to the shape layer and not the path. you need to select the path itself and copy to the path itself.
but unless you have a special case here, just use the feature that's already doing it for you.