Sucuri: Get_logs: Key not set

It means that the website has already an API in its database (probably from an old installation of the plugin, or from a different site inside the network). The action “get_logs” is only executed if the “sucuriscan_api_key” option is present in the options table, if this key is invalid then the plugin API service will responds with that error message.

The solution is to go to the plugin’ settings page and add a valid API key in the first form field that appears in the “General Settings” panel, you may need to “reset the plugin options” in order to do that.