Invoke powershell (Invoke-Rest) command from groovy does not return anything

I have a powershell command Invoke-RestMethod which is getting a file from Git.

Invoke-RestMethod -Headers @{Authorization = $('Bearer OTg....')} -Uri https://bitbucket.domain/repos/test/browse/base/test.txt?raw -OutFile test.txt

If I put that in groovy script and execute with groovy test.groovy:

["powershell", "command", "Invoke-RestMethod -Headers @{Authorization = 'Bearer OTg...'} -Uri https://bitbucket.domain/repos/test/browse/base/test.txt?raw -OutFile test.txt"].execute();

I am not getting any result or Error. Script is executed since I add some random println lines but I do not get my file.

Can someone please help me what I am missing? Or how this can be debugged further?

Thanks