We migrated our Sitecore 8.2 initial release to Sitecore 9.2.
In sitecore 8.2 initial release we had sitecore users synched with AD(using LDAP )
Since Sitecore 9.2 will not support AD, we removed all the configuration of LDAP.
When we login to core db -- [aspnet_Users] table, we are able to see our users(about 150 users)
But these users are not showing in the User Manager wizard.