Hey Andrea,
From the domain manager where you are running the deployment, try mapping \\pcname\admin$ as a network drive, using the credentials that you are deploying with.
e.g. File Explorer --> Map Network Drive
- Do this from the domain manager.
- Specify \\pcname\admin$ share.
- Specify the same account you are using for deployment.
The reason for this, is that when you use Start --> Run --> \\pcname\admin$ method, it will try to use implied credentials, e.g. your logged in user account. If that login fails, only then will it prompt you for credentials. Thus if you're getting through with implied credentials, and they are different from the ones you are specifying during deployment, then this is not a good test.
If you test works OK, then credentials seems not to be the issue. I would suggest opening a support case, as we will want to check the dmdeploy log in detail mode, to see the exact point of failure.
Regards,
Brian