Override the Default Universe Domain

  namespace g = ::google::cloud;
  namespace gcs = ::google::cloud::storage;
  [](std::string const& bucket_name, std::string const& object_name) {
    google::cloud::Options options;

    // AddUniverseDomainOption interrogates the UnifiedCredentialsOption, if
    // set, in the provided Options for the Universe Domain associated with the
    // credentials and adds it to the set of Options.
    // If no UnifiedCredentialsOption is set, GoogleDefaultCredentials are used.
    auto ud_options =
        google::cloud::AddUniverseDomainOption(std::move(options));

    if (!ud_options.ok()) throw std::move(ud_options).status();
    auto client = gcs::Client(*ud_options);
    PerformSomeOperations(client, bucket_name, object_name);
  }