Missunderstand directory.nh

Good afternoon, Mr. Principi,
since Upgrade NS7 >> NS8 we could work with the “wrong” user domain directory.nh … only some little problems…
But since update on beginning of may we have an annoying problem in nextcloud / file share https://community.nethserver.org/t/nextcloud-cant-create-share/25796
We think directory.nh is the reason.
Is there any way to change from directory.nh to firma.lan on the running system?
Sadly I don’t understand what to do … Hope you can help .