In recent years, virtual teaching and training environments, namely learning management systems (LMSs), have been increasingly used to monitor learning and to provide learning materials to students. This investigation evaluates the accessibility of the LMS platform used in a Portuguese university, using web accessibility validation tools, an evaluation made by accessibility specialists, and a focus group with students. This assessment considers the principles of the Web Content Accessibility Guidelines (WCAG) and universal design (UD) principles to identify platform accessibility errors. The results indicate that the LMS still has many basic-level accessibility errors. The errors are described and systematised and some suggestions for correcting them are presented. Finally, some perspectives for future research are proposed.