detect custom field on customer object set from the SSO/Desk Auth in web theme.

sso_custom_field.txt

{% if portal.authentication_enabled %}
{% if current_user.customer.custom_user_type == 'Student' %}
content for students who are logged into the support portal
{% elsif current_user.customer.custom_user_type == 'Teacher' %}
content for Teachers who are logged into the support portal
{% else %}
display error message
{% endif %}
{% endif %}