We are sorry to hear that you have this issue. You didn’t specify a version of used GroupDocs.Annotation, so we assume that you’re using the latest 1.8.0. We investigated the reported issues and were not able to reproduce them. Most likely, there are issues in the specific project. First of all, make sure that a user with “Context.User.Identity.Name” name doesn’t exist in the DB; if he already exists without specified first name and last name, specifying a “firstName” and “lastName” cannot help.
We recommend you to download a “GroupDocs.Annotation C# Demos” and investigate the projects - they show how to add annotations under specific account. For specifying a first name and a last name, open a “DocumentOpenSubscriber” class and specify corresponding first name and last name.
Yes, it is the most likely, in light of that fact that I was unable to reproduce the reported issues. Please try to use the latest version 1.8.0. Of course, don’t forget to clean the database and file-sessions.json.