Lights won't reach the whole image (leaving a black border) and I don't know why

My lights won’t cover the whole object I’m shading!
There always seems to be a thin border that is no lighted, no matter what y do.
Here you have some images that show my problem:
https://ibb.co/DbHFMbb
It’s even more evident looking from the distance…
https://ibb.co/9h44kPq

How can I get ride of this black line arround my light??

Here I’m showing a basic example and my node map:
https://ibb.co/GC7y16k

I duplicated the nodes from this video and was able to get a glow on an ellipse without the lines being a factor. Comparing yours to this there is a slight difference in the nodes. I am not sure whether it is the source of the problem.

https://www.youtube.com/watch?v=7koNGAe4Oes

This second video goes into more complicated variations and results. Sometimes it helps to see what produces what effects in order to better understand simpler objectives.

https://www.youtube.com/watch?v=ya327n5_D9A

I tried creating a blue ball with only colour vector lines (only the blue line) but the problem seems to keep reproducing.
https://ibb.co/LRJMv1x
Would you mind sending me a sample project with basic lighting so I can compare your settings to mine?

That would be due to the lines you are using. I am not sure how Harmony treats it but I would see whether it is sensitive to a line that includes a break with no visible line. Try drawing the object leaving a gap where you want the glow to reach the borders. Only use a line without a visible line in that gap. The exact term for a line that is not visible I cannot think of at the moment.

Thank you for updating us with the outcome YourTexasBenefits