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AutoRoute diffpair thru BGA w necking

Pkeefie

Allegro 16.2 XL windows

BGA region defined Via to line = 3.4, normal diffpair is 5 10 5 with a neck down of 3.6 3.7 3.6 that I can route manually thru the BGA no problem. I'm trying to auto route diffpairs thru a 1mm BGA but they won't neck thru the BGA they separate and take up to many channels. What am I missing or not setting correctly in CM?

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