Docker registry login appears to use wrong url

I have added a local Sonatype Docker Registry to my Teamcity instance.  When adding the Connection, testing the login succeeds and returns,

Connection to was successful!

When using the connection in a build definition and attempting to push to this registry, I receive

Cannot login to registry
An error occurred while executing 'docker login -u "******" --password-stdin':
Error response from daemon: login attempt to failed with status: 404 Not Found

The error is valid, that URL doesn't exist, but that's not the URL it was configured with.  

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