When installing zfs, posixacl isn't accepted

Ubuntu Version:
Server 24.04 LTS and 25.10

Problem Description:
I’m trying to create a zfs pool with acltype=posixacl
Both when creating the pool and when assigning the directive to a dataset (with sudo zfs set acltype=posixacl data_pool)
then with
zfs get acltype data_pool
I read always only posix.

I installed both the acl and attr packages, and of course zfsutils-linux.
I tried both server version 24.04LTS and 25.10.

What am I doing wrong or forgetting?