LDAP Config find no users

I have installed Gitea version 1.15.2 on a Debian 11 server. Now I want to integrate our AD so that the users are created automatically. Unfortunately, this does not work.

I have made the following settings:

User Search Base
CN=users,DC=dev,DC=local

User filter
(&(objectCategory=Person)(memberOf=CN=_DEV_GIT_USERS,OU=DEV_GROUPS,DC=dev,DC=local)(sAMAccountName=%s)(!(UserAccountControl:1.2.840.113556.1.4.803:=2)))

Admin Filter
(memberOf=CN=_DEV_GIT_ADMINS,OU=DEV_GROUPS,DC=dev,DC=local)

Restricted filter
(memberOf=CN=_DEV_GIT_USERS,OU=DEV_GROUPS,DC=dev,DC=local)

In the LDAP Browser tool from Softerra, the query works perfectly. However, the Gitea server does not find any users. The log says the following:

2021/09/23 09:06:30 …es/auth/ldap/ldap.go:451:SearchEntries() [T] Fetching attributes ‘sAMAccountName’, ‘givenName’, ‘sn’, ‘mail’, ‘’ with filter (&(objectCategory=Person)(memberOf=CN=_DEV_GIT_USERS,OU=DEV_GROUPS,DC=dev,DC=local)(sAMAccountName=*)(! (UserAccountControl:1.2.840.113556.1.4.803:=2)) and base CN=users,DC=dev,DC=local
2021/09/23 09:06:30 models/user.go:1916:SyncExternalUsers() [E] LDAP search found no entries but did not report an error. Refusing to deactivate all users