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Eyy Efe,
Have you check out Trusted sources? (click on your app and click on the Settings tab) You could have restricted access to database cluster.
Let me know if that helps - Sergio Turpín
Hello,
Have you defined your database details as environment variables as described here:
https://docs.digitalocean.com/products/app-platform/how-to/use-environment-variables/#databases
Best,
Bobby