So I fired up a new VM last night and installed MySQL8, php 5.6 and installed 1.10.4. It took some time, but I have figured out what the problem is. I am writing up a post about it now.
Could you please give me a link with direction how to implement LDAP plugin?
You put the plugin in the /includes/plugins folder.
Go to admin panel -> Manage -> Plugins.
Select the LDAP plugin.
edit the settings.
enable the plugin.