Use the EC2 IP address for outbound traffic from containers on EC2 to external partners.
ALB is not used as a gateway for outbound communication from the VPC to external partners.
Also, if your EC2 is on a private subnet, communication to external partners will require a NAT gateway or similar.
In that case, the IP address becomes the IP address of the NAT gateway.
Thank you for the detailed answer @Riku_Kobayashi! The EC2 instance is in fact in a private subnet so the use of a (pre-existing, in my case) NAT Gateway was the missing piece. This makes more sense now.
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