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You can create the point and the relation to line and the surface.
You have to make sure the 3D line is actually passing through the Surface.
- Than you can add sketch point and add coincident relation to your 3D line when you edit the 3D sketch.
- Then you pick the surface and the sketch point by holding the ctrl key while you are at it to add the "On Surface" relation
- Then you are ready for the tangent plane you wanted
Hope this helps.