You may have to adjust the version eg. v16 to a later version.
You are disabling the ZoomText/Fusion logon support by setting the relevant registry key but the logon support continues to run.
Application
You do not wish to have logon support enabled on a remote server to avoid interfering with use by non ZoomText/Fusion users.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Accessibility\ATs\AiSquared_ZoomTextUAC_v16
You may have to adjust the version eg. v16 to a later version.