src/tasts/ECRPushImage failed on Windows Agent

[tupenieks]

Describe the bug

Getting the next error when the task is executing on Microsoft Hosted Agents, tested with Windows 2019, 2022 and 2025 images:

Invoking 'C:\Windows\system32\docker.exe' with command 'login'
##[debug]which 'C:\Windows\system32\docker.exe'
##[debug]found: 'C:\Windows\system32\docker.exe'
##[debug]C:\Windows\system32\docker.exe arg: login
##[debug]C:\Windows\system32\docker.exe arg: -u
##[debug]C:\Windows\system32\docker.exe arg: AWS
##[debug]C:\Windows\system32\docker.exe arg: -p
##[debug]C:\Windows\system32\docker.exe arg: theTokenGenerated
##[debug]C:\Windows\system32\docker.exe arg: https://accountID.dkr.ecr.us-east-1.amazonaws.com/
##[debug]exec tool: C:\Windows\system32\docker.exe
##[debug]arguments:
##[debug] login
##[debug] -u
##[debug] AWS
##[debug] -p
##[debug] theTokenGenerated
##[debug] https://accountID.dkr.ecr.us-east-1.amazonaws.com/
##[debug]Process exited with code 1 and signal null for tool 'C:\Windows\system32\docker.exe'
##[debug]STDIO streams have closed and received exit code 1 and signal null for tool 'C:\Windows\system32\docker.exe'
##[debug]task result: Failed
##[error]Error: The process 'C:\Windows\system32\docker.exe' failed with exit code 1
##[debug]Processed: ##vso[task.issue type=error;source=TaskInternal;]Error: The process 'C:\Windows\system32\docker.exe' failed with exit code 1
##[debug]Processed: ##vso[task.complete result=Failed;]Error: The process 'C:\Windows\system32\docker.exe' failed with exit code 1

(The token and the account id where replaced by 'theTokenGenerated' and 'accountID' in order to avoid issues)

To reproduce

• Go to any ADO org where you have access
• Specify a pipeline with any windows agent and add the task on it, I have it on a template (Both yamls manually created and placed on a repo) but should be able to manage to mount it trough the ui.
• Create the pipeline on ADO referencing the yaml
• Run the pipeline
• Get the error (?)

Expected behavior

Task publishes the image to ECR

Your Environment

• Cloud based, microsoft hosted agents
• AWS Toolkit for Azure DevOps version 1.20.0

Additional context

I'm currently using this task on ubuntu agents without issues, but now I'm forced to build a net framework 4.8 app and I'm forced to use windows agents in order to build with the dockerfile.