Narrow Margins challenge not unlocking

So while playing incursion, we were down around 36-100. Then took down their first sentry. In the process they managed to get ours to 23. We then downed their final sentry. It was great! However,

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the challenge called Narrow Margins did not show as 1/1 completed or show Rank 2. It still says 0/1 for me. Even before that game, I find it hard to believe that I haven’t done it before. I am guessing there is a bug or that the description isn’t accurate. Below is also the Match ID in case it is needed for someone to investigate.

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Since there are two sentries, each sentry is only worth 50 points, with I’m assuming % health is in a .5:1 ratio with points. Thus, the last sentry at 25% health would be 12.5 points, and 23 points means your last sentry had 46% health.