Localization: How to change namespace and key and adapt them in blueprints?

So I took a look into the string table. Thanks for the info! This is easy going when I gather the text from there. Can set any key and namespace and the localization dashboard creates the localization files. All fine.

But what I dont understand is, why I can not find it in the blueprint with “Find Text in Localization Table”?

Using the drop down menu to set the namespace and key directly within the text variable also does not work. All works fine when I gather the text from the blueprint itself instead of the string table and use the namespaces and keys which are generated automaticly.

But I dont need that. I need to set my own namespaces and keys.

But when I set the namespaces and keys in the blueprint. It does not work. No result. Any Idea what Iam doing wrong?