Hi, welcome to the forum

When I converted your Tables to regular ranges, your formula worked fine in CF - didnt seem to like the Structured Table references.

I just used this...
=F8 < INDEX(Thresholds!$D$2:$D$16,MATCH(A8&H8,Thresholds!$A$2:$A$16&Thresholds!$E$2:$E$16,0))*0.5
CF only needs TRUE or FALSE, so you just need to structure your formula to give 1 of thise