I ordered prints using my phone. I attempted to check on my order on a different phone, (daughter, son, partner)’s phone and it said there were no orders. (I logged into my account on their phone.) Why?
The order is unique to the device. You can check on the order on your phone that you placed the order from.
Also, if the App is removed from the phone, the Order History is also removed. Reinstalling the App will not bring the Order History back.