Failed deposits can happen for several reasons and here are the most common ones:
Players who provide incorrect payment details will not be able to complete transactions. This is one of the most common reasons, and if the player's details do not match, the bank or payment service provider will automatically reject the transaction.
Players who have entered incorrect CVV2/CVC2 security codes.
Players who do not have enough funds in their accounts.
Players with more than 5 active credit cards may not be able to deposit.