Call to PackageService.GetTemplates() is returning null

We have been using Silanis .NET SDK for almost a year now and have a separate staging environment that uses the sandbox Silanis environment. However, today, this code below started failing as GetTemplates() is not returning anything. We're using Silanis.ESL v10.9.0.0. var client = new EslClient(ApiToken, BaseUrl); var templates = client.PackageService.GetTemplates(new PageRequest(0));