Thanks for using Bitnami. Can you give us more information about your Bitnami installation? Are you using a Bitnami single LAMP server for Google cloud from our launchpad or are you using a Multi-tier deployment? Can you check if opening MySQL port in the instance firewall through the Google Console helps you to fix this issue?
You can get more information about how to remotely connect with MySQL in the next link
Apart from that, we have a Support Tool that will gather relevant information for us to analyze your configuration and logs. Could you please execute it on the machine where the stack is running by following the steps described in the guide below?
Please note that you need to paste the code ID that is shown at the end.