[google-cloud-sql-discuss] Could not complete the operation message when trying to create a new mySQL First Gen database

I'm trying to create a new mySQL database on the Web interface and I keep getting the message "Could not complete the operation"

• instance ID: promeva-apf-sql
  
• Region: europe-west
• Tier: D1 512 MB RAM
• Database version MySQL 5.6
• Billing plan D1: Per use
• Preferred location: Follow App Engine app
• Automate backups 05:00 - 09:00
• Activation policy: Always
• Fire system replication: Asynchronous
• IPv4 addrss: Yes
• No Networks defined (yet)
• Only App Engine app as Authorised app

Is there any prerequisite to doing this? I have a working system so I'm following the setup documentation I've made. But since the error is so generic, I'm at a loss as to how to proceed.

Any thoughts?

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