We tried to access our application using Google Home Device. So, it did not understand the command. If I try the same through test simulator provided by assistant console, it is working fine.
Also, once our application is triggered through the simulator then it also works on the device.
Can anyone let me know what could be the issue?
During development, this sounds completely normal. An Action will be made available on all devices using the same account as the simulator once you first activate it in the simulator.
During Alpha and Beta testing, you need to follow the instructions to opt-in to the test version of the action.