If the security group and EC2 instance are both built in the Oregon (us-west-2) region check what VPC both resources are associated with and if the VPC ids match. When creating a security group you’ll be prompted for selecting what VPC the SG will be used for – the resources in the same VPC as the SG will be able to use that security group.
Have to check whether the SG being used in the video was created in the same region in a past video.
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