balance is not getting updated after a transfer

[BHUPESH003]

if i am making a transfer from one account to another then the request successfully returns the "Transfer Successful" message but the balance in the Database is not getting updated.
PS:
i have already tried the promise.all and findByIdandUpdate and findOneandUpdate nothing changes.

[paras-verma7454]

Try this code

router.post("/transfer", authMiddleware, async (req, res) => {
    const session = await mongoose.startSession();

    session.startTransaction();
    const { amount, to } = req.body;

    // Fetch the accounts within the transaction
    const account = await Account.findOne({ userId: req.userId }).session(session);

    if (!account || account.balance < amount) {
        await session.abortTransaction();
        return res.status(400).json({
            message: "Insufficient balance"
        });
    }

    const toAccount = await Account.findOne({ userId: to }).session(session);

    if (!toAccount) {
        await session.abortTransaction();
        return res.status(400).json({
            message: "Invalid account"
        });
    }

    // Perform the transfer
    await Account.updateOne({ userId: req.userId }, { $inc: { balance: -amount } }).session(session);
    await Account.updateOne({ userId: to }, { $inc: { balance: amount } }).session(session);

    // Commit the transaction
    await session.commitTransaction();
    res.json({
        message: "Transfer successful"
    });
});

[yesahem]

if i am making a transfer from one account to another then the request successfully returns the "Transfer Successful" message but the balance in the Database is not getting updated. PS: i have already tried the promise.all and findByIdandUpdate and findOneandUpdate nothing changes.

Github Link for the repo please