Works on one device but not the other
Why does the app works on one device but not the other?
First, try to set the device into Airplane Mode for 5 seconds. If the problem persists, reboot both devices and the internet router.
Try to narrow down which factors are different between both. It could be your network settings, the app version, or any other restriction.
If the problem still occurs, please send me an email at firstname.lastname@example.org