}
        };

        // Test with new entraid.permission.fields key
        systemPropMap.put("entraid.permission.fields", "displayName,userPrincipalName");
        String[] fields = fessConfig.getEntraIdPermissionFields();
        assertEquals(2, fields.length);
        assertEquals("displayName", fields[0]);
        assertEquals("userPrincipalName", fields[1]);
    }

    @Test

     * Uses new entraid.permission.fields key with fallback to legacy aad.permission.fields.
     * @return Array of permission field names.
     */
    default String[] getEntraIdPermissionFields() {
        String value = getSystemProperty("entraid.permission.fields", null);
        if (StringUtil.isBlank(value)) {
            value = getSystemProperty("aad.permission.fields", "mail");
        }

                    } else {
                        logger.warn("id is empty: {}", memberOf);
                    }
                    final String[] names = fessConfig.getEntraIdPermissionFields();
                    final boolean useDomainServices = fessConfig.isEntraIdUseDomainServices();
                    for (final String name : names) {