Hi! Hmm three times a day the digimon has to poop, if you don't get it in time it poops on the floor and the poop gauge resets to 100%, but it should give you notifications when they want to go to the bathroom.
The Scan Battles are working, how does it fail? does it not open a digimon to battle?
Some of this errors look like some incompatibility on the device.
If you want I can answer more fluently on the discord server!