Azure Devops Powershell

I am new to Azure Devops. We have a pipeline and one of the tasks in the pipeline is to copy some config files to another server and it looks like 

copy-item -path D:\Config\*.* -Destination '\\server\test\project\files' -r

It was working and there was a service account (username and password) added in variables. For deployment task (another task) it is added and password for that account was changed recently.I have updated the password in the secret variable but the powershell scripts is giving the following copy-item the user name or password is incorrect. I am not sure which account it is complaining about as there is no credentials set in the script and how to resolve this error.