Broken ad-connector synchronization

Hello,
I have a UCS latest version joined to a windows PDC.
All was working but today I have added a new user in the domain.
I can login with the user to the univention web interface (so it seems UCS join is good).
But I cannot login to Nextcloud in UCS.
I checked in UCS users and I do not see my new user so I cannot enable Nextcloud for him.
What can I do?
Thanks,
Mario

I have starting debugging and I have found that users are on ldap 389 and not on ldap 7389.
So I have checked /var/log/univention/connector-status.log and I have found this errors:

kerberosAuthenticationFailed: The following command failed: “kinit --no-addresses --password-file=/etc/machine.secret ucsdominio$” (1): kinit: Password incorrect

What can I do?

This not worked:
https://help.univention.com/t/accidentally-edit-etc-machine-secret/10132/4?u=mgiammarco

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