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It sounds like your Aurora is configured with a PUBLIC IP and you have not enabled VPC DNS Resoltion on the peering settings. https://docs.aws.amazon.com/vpc/latest/peering/modify-peering-connections.html#vpc-peering-dns
It could be that your EC2s in account A are connecting to RDS account B over the internet if you are using the Endpoint DNS Names. I have seen this type of miss configuration before if you do not enable the private DNS resolution.
This is if your CIDR Block of VPC A is accurate in your security group rule
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Thank you so much , this was the answer I was looking for. Issue solved.
Thanks Mahmoud.. Happy to help