Docker login on ECR fails with 400 Bad Request on Powershell from Jenkins

I've problem running docker login against AWS ECR with Powershell.
More specifically I'm running it from a Jenkins pipeline on Windows container (inside a K8S cluster) using the powershell step as follow

powershell "aws ecr get-login-password --region eu-central-1 | docker login --username AWS --password-stdin ****.dkr.ecr.eu-central-1.amazonaws.com"

but it fails with following error:

09:24:32  At C:\Jenkins\agent\workspace\test\awsIamRole-Test@tmp\durable-e2ffd0da\powershellWrapper.ps1:3 char:1
09:24:32  + & powershell -NoProfile -NonInteractive -ExecutionPolicy Bypass -Comm ...
09:24:32  + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
09:24:32      + CategoryInfo          : NotSpecified: (Error response ...400 Bad Request    :String) [], RemoteException
09:24:32      + FullyQualifiedErrorId : NativeCommandError

The strange behavior is that if I run the command manually on the container (both on my local machine and on the cluster) everything works fine and the login is successful. Below there's the container's Dockerfile.

# escape=`
FROM mcr.microsoft.com/windows/servercore:1809

SHELL ["powershell"] 

RUN Set-ExecutionPolicy Bypass -Scope Process -Force; [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072; iex ((New-Object System.Net.WebClient).DownloadString('https://chocolatey.org/install.ps1'))
RUN choco install jq docker -y 
RUN choco install awscli --version=2.1.15 -y

Since the container runs on an EC2 instance and I need to run Docker inside the container, I bind to Docker socket of underlying EC2 machine when launching the container on K8S, as shown below (it works since docker ps from the pipeline show the correct results).

  - image: "****.dkr.ecr.eu-central-1.amazonaws.com/jenkins-container-templates/docker-awscli2-windows:latest"
    name: "docker-awscli2-windows"
    tty: true
    volumeMounts:
    - mountPath: "\\\\.\\pipe\\docker_engine"
      name: "docker-pipe"
  volumes:
  - hostPath:
      path: "\\\\.\\pipe\\docker_engine"
    name: "docker-pipe"

What could be the problem?