I have a similar question for #21. I was marked wrong for the answer [45,4694,55] and the submission log says the 69 is incorrect. I have those middle two dots (at (1,5) and (5,5)) connected, and it looks like I could theoretically disconnect them and replace them with a line from (2,1) to (5,8) and get another potentially valid answer.

Is there a way to submit my completed grid to see if it might be an alternative solution?