On some docker registries the username is to be supplied as a chain of names each separated by forward-slash. For example [oracle cloud registry](https://docs.cloud.oracle.com/iaas/Content/Registry/Tasks/registrypushingimagesusingthedockercli.htm) uses the format `<tenancy>/<identityservice>/<username>`. Instead of encrypting this string as base64 and storing it as a single key in the password store, `docker-credential-pass` stores it as chain of sub-keys. Even though `docker login` is successful, all subsequent interactions like `docker pull` fail.