I tried using my Pluxee Gift code at a partnered merchant, but they refused to accept, and they mentioned that it is invalid

Since our Pluxee Gift code is connected to our merchant’s Point-of-sale terminals (POS) via internet connection, from time to time, connection errors will occur, and “invalid” messages will pop-up. If this happens, you may check our merchant locator for other branches or merchants accepting Pluxee Gift codes.