You hqven’t removed the database though. And the encrypted system properties are stored in there. Check this thread and comment or remove two lines with ldap in the security.xml (https://community.igniterealtime.org/message/238892#238892 10. message)
for testing, make the base dn the root of your domain
for your ldap lookup user account/admin dn try the following format username@domain.local
also, its possible the “test” button doesn’t work like in 3.9.1…so try going through the whole setup. If you’re able to add an openfilre administrator user from ldap, then you should be good to go.