Try reverse logic

src/freedombone-app-matrix

@@ -449,13 +449,12 @@ function add_user_matrix {
 
     "${PROJECT_NAME}-pass" -u "$new_username" -a matrix -p "$new_user_password"
 
-    echo "register_new_matrix_user -c \"${MATRIX_DATA_DIR}/homeserver.yaml\" -u \"${new_username}\" -p \"**********\" $add_user_matrix_admin http://localhost:${MATRIX_PORT}"
-    if echo 'y' | register_new_matrix_user -c "${MATRIX_DATA_DIR}/homeserver.yaml" -u "${new_username}" -p "${new_user_password}" $add_user_matrix_admin http://localhost:${MATRIX_PORT}; then
-        echo "0"
+    if ! register_new_matrix_user -c "${MATRIX_DATA_DIR}/homeserver.yaml" -u "${new_username}" -p "${new_user_password}" $add_user_matrix_admin http://localhost:${MATRIX_PORT}; then
+        echo "1"
         return
     fi
 
-    echo "1"
+    echo "0"
 }
 
 function install_interactive_matrix {