Dimmer doubling question

Having trouble getting the B half of my dimmer doublers to work. When I bring up dimmer 1a, the light in 1a illuminates. When I bring up dimmer 1b, nothing happens(not even the b led on the multiplexer lights up.  Any help would be appreciated.

Console: Element

Eos Version: 2.3

DMX port 1 and 2: Doubled

Dimmer double offset: 20000

Dimmer on sensor rack set to: DD

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