As far as I understand, this node only works based on the first UV tangent. I need to use the second, third, and so on. What is the solution?
Welcome 
…
I know of object and tangent space for normals… and they use UV maps…
…but i never heard of first, nor second or higher UV tangents.
You may have to elaborate this to get a more suited answer.
Thank you
if you create several uvmaps for an object, you will have several uv-tangents, but this node is limited to your first UVmap due to the lack of input for it. Fortunately, with the help of the open-source of Blender, I was able to rebuild this node along with the tangent input
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Ohh… you mean just another UVmap… yes the “standard” UV map is the first one and for any other there is Add → Input → UV Map… for whatever texture you are using it for…