AWS: Linux/UNIX platform is not available for Reserved Instance at N. Virginia region

Question

I have an EC2 instance running in the N. Virginia region. The "Platform details" is shown as "Linux/UNIX". Now I am trying to purchase a reserved instance after selecting the same platform in the search field. But it is showing:

Now when I search by the same options on a different region (eg: Oregon or N. California) the purchase options are coming through. Why?

Besides that, I have noticed another thing in N. Virginia. There are options coming with "Amazon VPC". What does that mean? How can launch an EC2 with a Platform like "Linux/UNIX (Amazon VPC)"?

Thanks in advance.

Answer 1

Now when I search by the same options on a different region (eg: Oregon or N. California) the purchase options are coming through. Why?

Amazon may not always have enough capacity for all platforms in all regions - this is why you're seeing different results.

There are options with "Amazon VPC" appended. What does that mean?

As per docs:

With EC2-Classic, your instances run in a single, flat network that you share with other customers. With Amazon VPC, your instances run in a virtual private cloud (VPC) that's logically isolated to your AWS account.

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Use Linux/UNIX (Amazon VPC) - nobody should be creating new instances using the EC2-Classic platform & is will be retired very soon.