Stripe create Token bank account

I'm trying to add a token to create a bank account with stripe.

tokenAccount: async (req, res) => {
    Serveur.findOne({ _id: req.user._id }, async (err, user) => {
      try {
        await stripe.tokens.create({
          bank_account: {
            country: req.body.country,
            currency: req.body.currency,
            account_number: req.body.account_number,
            routing_number: req.body.routing_number,
          },
        });
      } catch (error) {
        return res.status("402").send({ error: { message: error.message } });
      }
    });
  },

and when i test the back end with postman with a "test" bank details from stripe i have this error :

{
    "error": {
        "message": "You cannot use a live bank account number when making transfers or debits in test mode"
    }
}

Which is weird because i used the test stripe's bank details. Do you have any idea what the problem could be ???