Auto Sync LDAP Groups to Channels not working

Hello,

we are using the following configuration
Server Setup Information
Version of Rocket.Chat Server: 2.4.9
Operating System: Ubuntu LTS
Deployment Method: snap
Number of Running Instances: 1
DB Replicaset Oplog:
NodeJS Version: v8.17.0
MongoDB Version: 3.6.14
Proxy: caddy
Firewalls involved: no
Active Directory: Windows Server 2012R2

If we enable "Auto Sync LDAP Groups to Channels", one user can login. After this login the Channels are created and now no one else can login to rocket chat. They got an error message "wrong user or passwort". If i logout with this user, the user can not login anymore. I have to delete these channels with the rocket chat admin and then the same happens - i can login one time, channels are created and no login is possible after that.

If i disable LDAP Group to Channel Sync the AD Authenthication is working fine.

The Config looks like this:
Base DN
OU=KTS,DC=my,DC=domain,DC=com
User Group Filter
(&(sAMAccountName=#{username})(memberOf:1.2.840.113556.1.4.1941:=CN=#{groupName},OU=RocketChat,OU=SecurityGroups,OU=KTS,DC=my,DC=domain,DC=com))
LDAP Group BaseDN
OU=KTS,DC=my,DC=domain,DC=com
User Search filter
(&(objectCategory=person)(objectclass=user)(memberOf:1.2.840.113556.1.4.1941:=CN=RC_Users,OU=RocketChat,OU=SecurityGroup,OU=KTS,DC=my,DC=domain,DC=com))

Any Idea whats going wrong? I was doing my first tests with a earlier version and the Group Sync was working fine.

i wrote a mail to the support but i dont get any feedback to this problem.

Start with the LDAP Group to Channel Sync configuration and the login flow described for Rocket.Chat 2.4.9, using the supplied Active Directory filters and deployment versions to reproduce the failure. Done means channels are synchronized without preventing other users from logging in, and authentication continues to work after the first login.