If you are doing the free account you need to PM @YiannisH_3CX or @JohnS_3CX your FQDN and they can look into it. If you are using your own Google Account then you can restart your VM.
You can PM me with your FQDN if this is a free 3CX-hosted account, otherwise you will have to use your own Google Compute engine credentials here https://console.cloud.google.com/compute