18.4 Automated Deployment Manager : SSO credentials not getting validated

Guys,

Automated Deployment Manager plugin been deployed in 18.4 version. When we executed the script (.../appianDeploymentManager/deploy-application.sh) from linux box using SSO credentials it throws the below error message.

"APNX-1-4187-003","message":"Incorrect user name or password. Please check your credentials and try again.","title":"An Error Has Occurred"}

Where as , when i use the Appian Direct user id and password, it is working. Please help me to understand why the sso credentials are not getting validated ? Also help me, how to make SSO credentials work on this script.

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