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The API, CLI and MCP return mail_domain_required with HTTP 409. Repeating the same request unchanged does not help.

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What to do

This app declares mail.enabled. Configure the project’s own sender domain with ‘ohmyhost mail setup’ using its Prod environment ID, or set mail.enabled to false if the app sends no mail, then plan again. If the steps above do not resolve it, report it with the request_id from the error.