Unable to create secrets in SI tests

Installing dcos-enterprise-cli package

》dcos package install dcos-enterprise-cli --cli --yes

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Installing CLI subcommand for package [dcos-enterprise-cli] version [1.3.0]
New commands available: dcos security, dcos backup
  0
Creating a config.json content for dockerhub username ****
Creating new secret pullConfig:{"auths": {"https://index.docker.io/v1/": {"auth": "bWVzb3NwaGVyZWNpOm5vUnBORnZ0aGc4Tg=="}}}

》dcos security secrets create -v {"auths": {"https://index.docker.io/v1/": {"auth": "bWVzb3NwaGVyZWNpOm5vUnBORnZ0aGc4Tg=="}}} pullConfig

 Error: Bad request
 2

┍┈┈ ✕: tests/system/test_marathon_root.py::test_create_pod_with_private_image 
┊ error: /jenkins/workspace/system-integration-tests/marathon-si-pr/tests/system/common.py:508: AssertionError: Failed to create a secret
》[0.1s/5m] [1 of 3 times] spinning...
》[1.1s/5m] [2 of 3 times] spinning...
exiting wait_for_marathon_and_cleanup fixture