I have am building a simple code AWS Code Build task, loading code from code commit.
When I create the task from the console all is good. But if I create the task from CloudFormation, I get the following error when running the task:

CLIENT_ERROR: repository not found for primary source and source version

My CloudFormation looks like this:

"Project": {
        "Type": "AWS::CodeBuild::Project",
        "Properties": {
            "Name": "DockerBuild",
            "Description": "Build a docker Image of the Project",
            "ServiceRole": {
                "Fn::GetAtt": [
                    "CodeBuildServiceRole",
                    "Arn"
                ]
            },
            "Artifacts": {
                "Type": "no_artifacts"
            },
            "Environment": {
                "Type": "LINUX_CONTAINER",
                "ComputeType": "BUILD_GENERAL1_SMALL",
                "Image": "aws/codebuild/java:openjdk-8",
                "EnvironmentVariables": [
                    {
                        "Name": "AWS_DEFAULT_REGION",
                        "Type": "PLAINTEXT",
                        "Value": "ca-central-1"
                    },
                    {
                        "Name": "AWS_ACCOUNT_ID",
                        "Type": "PLAINTEXT",
                        "Value": {
                            "Ref": "ServiceName"
                        }
                    },
                    {
                        "Name": "IMAGE_TAG",
                        "Type": "PLAINTEXT",
                        "Value": "latest"
                    },
                    {
                        "Name": "IMAGE_REPO_NAME",
                        "Type": "PLAINTEXT",
                        "Value": {"Ref":"Repository"}
                    }
                ]
            },
            
            "Source": {
                "Location": "git-codecommit.ca-central-1.amazonaws.com/v1/repos/demoRepo",
                "Type": "CODECOMMIT"
            },
            "SourceVersion": "refs/heads/main",
            "TimeoutInMinutes": 10,
            "Tags": []
        }
    }

If I try to update the Source from the task, it finds all commit number, so the source should be good.

Note that, not sure if it is related or not, but if I try to save my update on source with the option “allow AWS CodeBuild to modify this service role”, I get the following error:

The policy was not attached to role CodeBuild-CodeBuildServiceRole-XXXXXXX

I am not sure why nor if this has an impact.