Jenkins Server - trying to run AWS cli script - getting an error

[AboveBeyond]

I am running a Jenkins server on Windows server with AWS CLI installed. while trying to run a script through Jenkins job i get the following error:

"You must specify a region. You can also configure your region by running "aws configure"."

AWS cli is configured (running the script manually - all good)

Script: aws ec2 run-instances --image-id ami-12345 --count 1 --instance-type m4.large --key-name my-key --security-groups defaultSG

(If i add a --region im getting: "Unable to locate credentials")

Thanks !