Why Retrofit Authenticator does not refresh token?

I am building an app with Retrofit , Dagger etc. and using Authenticator to refresh the token. I have set the token expiry time to 1 minute just to see if the Authenticator is triggered and it's not.

Below is my Authenticator implementation

public class TokenAuthenticator implements Authenticator {

private ServiceManagerHolder serviceHolder;

@Inject
public TokenAuthenticator(@NonNull ServiceManagerHolder serviceHolder) {
this.serviceHolder=serviceHolder;

}

@Nullable
@Override
public Request authenticate(Route route, Response response) throws IOException {
if(serviceHolder.serviceManager() ==null)
{
return null;
}

if(response.code()==401) {
Request request = response.request();
serviceHolder.serviceManager().refreshAccessToken(GRANT_TYPE_REFRESH,
KikoConstants.AUTH_TOKEN_TIMEOUT, ANDROID_CLIENT_ID,
CLIENT_SECRET,
REFRESH_TOKEN)
.enqueue(new Callback<GetTokenResponse>() {
@Override
public void onResponse(Call<GetTokenResponse> call, retrofit2.Response<GetTokenResponse> response) {
Log.e("Authenticator refreshing token :::", "In progress");
//code to save the token
request.newBuilder().header("Authorization", "Bearer " + newAccessToken);
}

@Override
public void onFailure(Call<GetTokenResponse> call, Throwable t) {
Log.e("Error refreshing token",t.getMessage());
}
});
return response.request();
}else
{
return response.request();
}
}
}


Service holder here is a reference to the webservices implementation class

Any ideas what i'm doing wrong ?

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