Can't login with ldap user on remote instance

CMK version: 2.1.0b5
OS version: Ubuntu20

Error message:
var/log/web.log on remote instance:

ldap.OPERATIONS_ERROR: {'msgtype': 101, 'msgid': 2, 'result': 1, 'desc': 'Operations error', 'ctrls': [], 'info': '000004DC: LdapErr: DSID-0C0907E9, comment: In order to perform this operation a successful bind must be completed on the connection., data 0, v2580'}

Output of “cmk --debug -vvn hostname”: (If it is a problem with checks or plugins)
N/A

I have set in the “Distributed monitoring” following:
Sync with LDAP connections → Sync users with all connections

Can the remote site reach you LDAP server directly and login?

We had configured a distribution and the remote has WATO configuration disabled. After enabling WATO configuration on remote, we noticed that the password in the password store was not synced (no stars shown in the password field) After adding the password in the password store on the remote, the LDAP login started to work.
This let us assume that all passwords in the password store do not get synchronised. This seenms to be a bug. Or are we missing something in the distribution configuration?