AWS::ApiGateway::GatewayResponse Invalid API identifier specified when deploying authorizer

Serverless Framework
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1

Trying to add custom responses to gateway authorizer. The authorizer is deploying fine but the custom response is not attaching to the correct API. I keep getting an error and hours of googling has turned up nothing.

Error:

 An error occurred: GatewayResponseInvalidApiKey - Resource handler returned message: "Invalid API identifier specified 892584095726:zu8pz12we8  (Service: ApiGateway, Status Code: 404, Request ID: 826a0602-99be-40a4-9eeb-9ec4b75cdb91, Extended Request ID: null)" (RequestToken: 14cd04c7-2443-1705-5b06-bcf03ca675e5, HandlerErrorCode: NotFound).

Those ID above I changed for the example above. Notice that cloud formation (or serverless) is stuffing a random 892584095726 and a colon : before the api key.

I’ve double checked in the aws console and the zu8pz12we8 is correct for the api key (again not the real number I changed it for this example)

Code:

GatewayResponseInvalidApiKey:
      Type: 'AWS::ApiGateway::GatewayResponse'
      Properties:
        RestApiId:
          Ref: HttpApi
        ResponseType: ACCESS_DENIED
        ResponseTemplates:
          #https://stackoverflow.com/a/49806967/10212963
          application/json: "{ \"message\": \"$context.authorizer.customErrorMessage\" }"
        StatusCode: 403

I’ve also tried referencing the CF output directly as follows with the same result:

RestApiId: "${cf:${self:service}-${self:custom.stage}.HttpApiId}"