Hello everyone, please help me set up LDAP authorization! 
I am interested in the relationship: email + password from the user account in the "AD" directory.
I tried to do it myself using this instruction: www.limesurvey.org/manual/Authentication_plugins but nothing comes out. As if everywhere you need to first create an account in the LimeSurvey database, and only then log in under the domain user account. 
And I want the domain user to just enter their email address and account password and log in. Is it even possible?
LimeSurvey Community Edition Version 6.2.2+230814

Here is my plugin AuthLDAP setup:

LDAP server: 
ldap://ad.moon.sp
Port number: 
389
LDAP version: 
LDAPv3
Select true if referrals must be followed (use false for ActiveDirectory): 
False
Enable Start-TLS: 
False
Select how to perform authentication.: 
Search and bind
Attribute to compare to the given login can be uid, cn, mail, ..: 
mail
Base DN for the user search operation. Multiple bases may be separated by a semicolon (: 
CN=limesurvey;CN=Users;DC=Moon;DC=sp
Optional extra LDAP filter to be ANDed to the basic (searchuserattribute=username) filter. Don't forget the outmost enclosing parentheses: 
None
Optional DN of the LDAP account used to search for the end-user's DN. An anonymous bind is performed if empty.: 
None
Password of the LDAP account used to search for the end-user's DN if previoulsy set.: 
Password of the limesurvey account
LDAP attribute of email address: 
None
LDAP attribute of full name: 
None
Check to make default authentication method: 
Yes
Automatically create user if it exists in LDAP server: 
Yes
Grant survey creation permission to automatically created users: 
Yes
Optional base DN for group restriction: 
None
Optional filter for group restriction: 
None
Allow initial user to login via LDAP: 
Yes

My server is MS Windows Server 2012 R2

But when logging in under credentials:
email address + domain account password, I get error:

Problem solved!
Here is the solution: github.com/LimeSurvey/LimeSurvey/blob/21...AP/AuthLDAP.php#L303

Thanks a lot for sharing your solution!

We have also included the mentioned fix at our plugin variation. If you are interested in an advanced version of the LDAP plugin which supports an automatic update of user full name and email address at every login, check this free Auth LDAP LimeSurvey Plugin:
survey-consulting.com/product/extended-a...p-limesurvey-plugin/