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Thank you for reaching out to the SE Community, my name is Jon and I will assist you with this query. We've seen this issue when the wrong firmware is loaded on the card, since the NMC is installed on a Symmetra Single-Phase it should be loaded with the SY firmware.
Keep in mind that the AP9619 belongs to the NMC1 family and is already obsolete. Luckily, I was able to find the firmware that would work for you.