1 coffee mug/tea cup of water in the microwave for 1 minute is perfect for a single serving bag of tea. it doesn't have to be boiling, just hot. 1 min is also not long enough to dangerously superheat water. hot is water is hot water, it doesn't matter if you do it kettle or microwave.
edit: lol
yeah, no, uh, i regret to inform ya'll that toxic bpa receipt paper potentially causing hormone problems thru skin absorbtion is an actual thing and not some weird bs conspiracy theory thing: https://www.cbsnews.com/news/bpa-receipts-major-store-chains-study/
it's unsure how much of an effect it has on humans so far but it does affect lab animals.