The invalid license key error message usually appears in the AskCody Signage app because of two reasons:
1. The license key is invalid.
Solution: Please make sure that the license key is correctly typed into the text fields.
2. There is no network connection.
Solution: Please exit the AskCody app and check the network settings on the device. If the device seems to be connected to a network, please test this by opening a webpage (like Google) on the built-in browser.