How can I execute a PowerShell Script from the Script task in a Bamboo job?

[Devi Nair]

I need to execute a PowerShell script in Bamboo. Below are the steps I did:

• Add task in a Job - 'Script' Task
• Selected the Interpreter as 'PowerShell'
• Tried Script locations as both inline and File (using Inline, tried to run Write-Host command). Using File, I tried executing a .sh script (which build successfully in the same bamboo agent when run directly using PowerShell in admin mode in that machine)

Note : the build agent is a windows machine

The task failing with error - 

Failing task since return code of [powershell -NonInteractive -ExecutionPolicy bypass -Command d:\bambooagent\temp\MER-BPMUI-JOB1-33-ScriptBuildTask-7361736628996142855.ps1] was -1 while expected 0

The PowerShell Execution policy of the build agent machine is 

Scope                      ExecutionPolicy
-----                         ---------------
MachinePolicy         Restricted
UserPolicy                Restricted
Process                    Undefined
CurrentUser             Unrestricted
LocalMachine          Unrestricted

I am blocked in this step. Looking for urgent assistance on this. What needs to be done?