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For RDS you need a minimum of 2 subnets configured. Ensure you have updated your subnet group’s configuration
Your error message also reads your CIDR range is too small. I’d check the number of free IP addresses available.
Your VPC must have at least two subnets. These subnets must be in two different Availability Zones in the AWS Region where you want to deploy your DB instance. A subnet is a segment of a VPC's IP address range that you can specify and that you can use to group DB instances based on your security and operational needs.
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The number of subnets in your db subnet group do not impact the price. More subnets gives RDS more flexibly in placement of your instances.
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