Access Output Variables on Different Region

Serverless Framework
1

I am receiving an error when trying to access output variables on a different region. I am following the docs on how to access output from a different region.

Docs:

Message

   Serverless Error ---------------------------------------

  Invalid variable reference syntax for variable cf.us-east-1:test-region-1-dev.Region1Output. You can only reference env vars, options, & files. You can check our docs for more info.

Source
service: test-region-2

provider:
  name: aws
  runtime: nodejs8.10
  region: us-east-1

functions:
  hello:
    handler: handler.hello

resources:
  Outputs:
    Region2Output:
      Description: 'Description for the output'
      Value: 'REGION 2 IS THE BEST'
    Region1:
      Description: 'Description of Region 1'
      Value: ${cf.us-east-2:test-region-1-dev.Region1Output}