snyk test command failing silently in pipeline

[ashish]

I am using maven docker image as base image to run pipeline - maven:3.6.3-jdk-11

In my pipeline, I run mvn install and then run snyk test. Here are snyk specific logs - 

+ snyk auth $snykapikey

Your account has been authenticated. Snyk is now ready to be used.

+ snyk test --all-projects --json > snyktestoutput.json
Skipping cache upload for failed step

And here's pipeline definition - 

custom:

    run-synk-tests:

      - step:

          name: Run Snyk tests

          caches:

            - maven

          script:

            - apt-get update && apt-get install -y nodejs

            - curl -L https://npmjs.org/install.sh | sh

            - npm -version

            - npm install -g snyk 

        

            - mvn -B install

            - snyk auth $snykapikey

            - snyk test --all-projects --json > snyktestoutput.json

            - pipe: snyk/snyk-scan:0.4.3

              variables:

                SNYK_TOKEN: $snykapikey

                SNYK_TEST_JSON_INPUT: "snyktestoutput.json"

BTW, snyk command does not fail if I just run this in pipeline

 - snyk test --all-projects

 and comment out all pipe and output file related lines.