Please provide a screenshot.
I'm pretty sure we already fixed it. Maybe it was after the release.
Thanks for your reply Anton.
-We perform a clean installation downloaded from https://github.com/traccar/traccar/releases/download/v5.3/traccar-linux-64-5.3.zip.
-The problem is the same
-Discover that the problem occurs when an expiration date is assigned to a privileged user.
-It seems that there is a problem in the expiration date assignment section, it cannot be left null, after having assigned expiration
Have you tried the preview version?
Traccar version 5.3 modern interface. Registration of new users is not possible through normal user with number of assigned users, only administrator can register new users.