Time synchronization error

When you get the error after the Speaker installation:

"Failed to check time synchronization on your server. Your server’s clock must be in sync with network time protocol – NTP."

It means the timestamps in your servers and at Google are misaligned, token validation fails. Even a 5ms difference matters and may cause a problem. 

To solve the issue you need to contact your host/server support and ask to install the NTP and check if there is a time offset.