hello Emma,
thank you very much for your help. I finally get it work last Friday. the issue was not the settings. all that looks like was working. after going back and forward and almost give up, the issue was that the users i had created manually, had to change from manual account to active directory account on the user profile. so was not the settings in the LDAP settings, it just changed that part of the accounts.
No the only issue I have right now is that the user I had created as a course creator lose the ability to edit or create a course. have any idea why this happens?