Docker in VM in AWS

I have created a VM in AWS. Assign to it Security Group with PORTS 8080-8089 Open.
Inside my VM I am running a docker of a server mapping my VM port 8081 to the Docker port 8080.
using "docker run –name mynameddocker -d -p webapp"

Now, Inside my VM I can access localhost:8081 using a web browser. But the issue is trying to access it from outside VM.!!!!
My assumption that I can access it using AWS_Instatance_Public_IP:8081.

But nothing worked. I have a security rule that states open all TCP port, but still no access.
I have tried the same in Google Cloud Platform. But no progress
Any Idea ??

Source: Docker Questions