Text binging problem

Hi. I have a string table:

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An UI element, which create a widget with some message

And trigger blueprint, which create widget with text.

On this blueprint I have a public variable st_key - name of key in the string table.
When I pass value to it - it don’t work. I think I should setup binding somehow.
I’ve tried some cases but it still don’t show text - it always empty.

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This site is useless…