Issues Nextcloud 15.0.4 with LDAP Secure

[yourcloudasia]

I’d give you the same advice as this (check the Login Attributes tab):

Cannot to connect to working LDAP-Server

Try deleting your LDAP configuration and starting again; the LDAP app can be a bit buggy when making multiple changes. Your problem is likely to be on your Login Attributes tab. The defaults of LDAP / AD Username and LDAP / AD Email Address should work fine.