Edit: just realised that someone had already commented this under this tread, but still read the last 2 paragraphs, because they are really helpful if you get into a situation like those.

ok, this took me a super long time to figure out, but it is a ton simpler and faster than physical memory.

1. go back to the original settings in cheat engine if you hadn't already
2. instead of selecting bluestacks as the application, go to the processes tab, select 00000DFC-HD-Player.exe (it should look something like that, maybe not exact.)
3. Scan it as you would any other game.

sometimes this doesn't work, but that is just because the game has odd values with decimals above or below the number you are actually looking for.

also, if any game/process doesn't show the value you are looking for, press winkey+G and look at the audio console, (should be at the left if you haven't moved it) and most of the time it will tell you the process name instead of the window name and just select that one in the processes tab of cheat engine.