AWS-CDK Typescript-How to allow full inbound traffic on security group of anrdsproxy so that multiple sagemakers can access it

[steelpack]

I want to add full inbound traffic within my VPC so that any sagemaker users in my team can access my RDSproxy.I am using a postgres database with tcp 5432. In the CDK, I have used the code below but its not working. Any Suggestions how to open full inbound traffic for multi sagemaker users.
// Allow all security groups within the VPC to access the RDS Proxy on port 5432
rdsProxySecurityGroup.addIngressRule(
Peer.ipv4(vpc.vpcCidrBlock),
Port.tcp(5432),
'Allow access from all security groups within the VPC'
);