Off the top of my head, I had thought that button mushrooms are one of the more difficult kinds to grow?
I think it's because they are the sort of mushroom that grows on already semi-composted materials, which is why commercially they are grown on manure
compost (I think?)
In home growing personally I've stuck to the 'easier' mushrooms which are the type that grow on wood waste. Stropharia mushrooms are what I grow because they are the closest to store-bought button mushrooms from what I can gather (I don't like oyster mushrooms much). If you pick them when they're young they are so tender and taste somewhat like portabello. So not exactly button mushrooms but not that far...
In addition they seem to thrive on neglect. I threw the mycelium that I bought into a garden bed mulched with wet cardboard and wood chips and pretty much left it to its own devices, and with the fairly regular rains that we get here through the summer they pop up on their own three times a year - and they are perennial!
Anyways, those are my thoughts ... hope it helps.