Create Sightlines only creating one set of lines

[WhitneyRScott]

Hi! I've been playing with the create sightlines tool and have changed a couple settings and keep getting the same result. I have 3 observer points and one line I'm trying to construct between. The output keeps being only 3 lines (one from each observer) to the beginning of the line. I've made the sampling distance a broad range of values and keep getting the same result. Help please!

[DanPatterson]

Construct Sight Lines (3D Analyst)—ArcGIS Pro | Documentation

What parameters did you use?

do both observer and targets have z values defined?

and specifics on coordinates etc would be useful