Nextcloud+Collabora+LDAP: Porblem with some users

Greetings.

I have a weird problem:

I have nextcloud 21.0.2 with collabora and LDAP users. Some users can connect to collabora and edit docs and everything.

But some users don’t.

Output of journalctl -u loolwsd.service:

ago 04 12:45:38 cloud.example.com loolwsd[705]: kit-04248-01627 2021-08-04 15:45:38.005538 [ kitbroker_030 ] ERR Exception while loading url [file:///tmp/user/docs/XXXXXXX/SomeDoc.ods] for session [1bf]: Invalid or unsupported charset:us-ascii or UTF-8| kit/Kit.cpp:1011
ago 04 12:45:38 cloud.example.com loolwsd[705]: kit-04248-01627 2021-08-04 15:45:38.005603 [ kitbroker_030 ] ERR Failed to get LoKitDocument instance for [file:///tmp/user/docs/XXXXXXX/SomeDoc.ods].| kit/ChildSession.cpp:684

The LDAP users have not charset config or something like that.

What can it be? What outputs do you need? How can I trace it more deeply?

Thanks!