As a quick follow up, the exact same code is currently delivering notifications without any issue. The only difference is I am currently on my laptop with only a wifi connection whereas earlier when I posted this issue I was on dual connections (via thunderbolt -> monitor ethernet hub) with the ethernet adapter prioritized above wifi. I'm wondering if a part of this could be the multiple connections?

I am also experiencing this same issue with the observed "discarded as device was offline" and "stored for device power considerations" behavior.