Sometimes, when enabling lost mode on a Device, it can lose its internet connection, making it unreachable from Applivery. This prevents you from disabling the lost mode.
The most common scenario is when an Apple device in lost mode runs out of battery and turns off. When it's turned on again, the Device has lost its internet connection. Therefore, it's impossible to send the ‘Disable lost mode’ command (or any command) through Applivery because there's no communication between the Device and Applivery.
It's also not possible to connect it to a Wi-Fi network (neither through USB connecting it to the computer, nor sharing data from another Device…) since the screen will be locked down in lost mode.
However, there are a couple of potential solutions:
The first option is to use a SIM card with the PIN deactivated and an active data network. Insert it into the Device, and it will automatically connect to the internet and receive all pending commands, including the “disable lost mode” command.
A second option is to use a Lightning to RJ45 adapter to connect to an existing wired internet network. This achieves the same goal.
Ensure the SIM card has sufficient data and the Lightning to RJ45 adapter is compatible with the Device.