Why my 6* Winter soldier prestige is 0 at sig 40?

Aamir123

I have 6* ws at sig40 and its prestige is 0. I tried many calculators and prestige bots but it shows 0 or error. Why?
I took screenshot of him with all masteries removed. Can anyone help me to get his prestige?

Unknown

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Lvernon15

They just don’t have the data, that looks to be his prestige