Getting the field-values of another user

Hi,

I have a custom group field (location = user) consisting of type of document and the url of the document.
This relates to students, a student can see his own documents.

I want the teacher to be able to see the documents as well.
To facilitate that, there is a custom field student_id - for the student it always contains his own user.ID, for the teacher the user.ID of the student he's watching. This field always contains the right value, I've doble-checked that.

For the student it's working properly, but the teacher doesn't see the student's documents.

This is my code (for documented interviews):

{% set counter = 0 %}
{{ user.student_id }}
[rwmb_meta id="user.document_group" object_id="{{ user.student_id }}"]

<div class="sub_container">
{% for clone in user.document_group %}
    {% if 'Interview' in clone.type_of_document.value  %}
        {% set counter = counter +1 %}
        <div class="sub_item">
        <a href="{{ clone.document }}"><img class="alignnone size-full wp-image-328" src="https://<mydomain>/wp-content/uploads/sites/57/2024/07/pdf.jpg" alt="" width="128" height="159" /></a><br>
        <a href="{{ clone.document }}">{{ clone.type_of_document.value }}</a>

        </div>
    {% endif %}
{% endfor %}
</div>

{% if  counter == 0 %}
    No Interviews yet
{% endif %}

(I just display the student_id to confirm the user id being watched.)

Pls help me to get the code working for the teacher as well.