Is it permissible to open an investment account with Banque Al Baraka Tunisia, a known Islamic bank?

It is permissible to open an investment account in Islamic banks if the Shariah-compliant controls are met. These are: that the bank invests the capital in buying and selling through lawful means, that the profit ratio is shared between the two parties and not predetermined, that the capital is not guaranteed, but rather its owner bears the loss unless the bank is negligent, and that the bank does not invest the funds in prohibited transactions. If these controls are met, then what is called a savings account or an investment account is valid, and this is Mudarabah (partnership in profit), which scholars have unanimously agreed upon its permissibility.