On the VPCs page, the Create workflow allows you to choose which org you create a VPC in. If you choose an organization that is not your personal default organization, the create will work, but the only indication you get in the UI is that something was not found.
What's happening is:
POST to create the VPC, get a 201 Created response with the VPC details.
GET on vpcs/ with the ID of the newly created VPC. Get a 404 Not Found response.
When the VPCs page is loaded, only the VPCs for the default org are included in the response.
On the VPCs page, the Create workflow allows you to choose which org you create a VPC in. If you choose an organization that is not your personal default organization, the create will work, but the only indication you get in the UI is that something was not found.
What's happening is: