Fn::ImportValue not expanding - amazon-web-services

Question

I have an SAM template that creates an API Gateway API exporting the API Endpoint:
AWSTemplateFormatVersion : '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: 'API Server for Skynet: AWS Management Assistant'
Resources:
ApiGatewayApi:
Type: AWS::Serverless::Api
Properties:
DefinitionUri: swagger.yml
StageName: prod
Variables:
Region: !Ref AWS::Region
AccountId: !Ref AWS::AccountId
Outputs:
ApiEndpoint:
Description: API Endpoint
Value: !Sub
- 'https://${ApiId}.execute-api.${AWS::Region}.amazonaws.com/prod'
- {ApiId: !Ref ApiGatewayApi}
Export:
Name: !Sub '${AWS::StackName}-ApiEndpoint'
In my CodePipeline/CodeBuild stack: I am referencing it:
CodeBuildWeb:
Type: AWS::CodeBuild::Project
Properties:
Name: !Sub '${PipelineName}-web'
Artifacts:
Type: CODEPIPELINE
Environment:
ComputeType: BUILD_GENERAL1_SMALL
Image: aws/codebuild/nodejs:7.0.0
Type: LINUX_CONTAINER
EnvironmentVariables:
- Name: S3_BUCKET
Value: !Ref S3WebBucket
- Name: API_URL
Value: Fn::ImportValue
!Sub '${PipelineName}-server-ApiEndpoint'
ServiceRole: !Ref CodeBuildRole
Source:
BuildSpec: 'web/buildspec.yml'
Type: CODEPIPELINE
Problem is, its not expanding, in my code, I see ApiEndpoint as Fn::ImportValue !Sub '${PipelineName}-server-ApiEndpoint' whats wrong here?

Answer 1

OK, I found my mistake:
- Name: API_URL
Value: Fn::ImportValue:
!Sub '${PipelineName}-server-ApiEndpoint'
I should add a : after Fn::ImportValue