Dw10 not signaling

I have 2 brand new dw10 2gig sensors that will not open or close. I have replaced batteries to no avail. I have them set to loop 2. Tamper reports to panel instantly. I’m holding magnet next to it. Any ideas? One I could see being bad, but not 2…

What are the first four digits of the serial number on those two sensors?

I wouldn’t typically jump to devices being defective as that is always the rarest option, but in the specific case of the DW10, that very description is an issue which affected a small percentage of units from at least one manufacturing run in the past.