A problem known as multi-user mode not working occurs when several users cannot access or use a system, application, or service at the same time. Network restrictions, software problems, server limitations, or incorrectly configured settings can all contribute to this issue. Verifying server capacity, updating software, validating user permissions, and looking for problem messages in logs are some possible troubleshooting techniques.Give a QB support agent a call at 1.855.738.2784.