Incorrect card details – Ensure the card number, expiry date, and security code are entered correctly.

Insufficient credit limit – Contact your bank or try using a different card.

Bank restrictions on foreign transactions – Some banks block international payments. Check with your card issuer.

Multiple failed attempts – Repeated attempts may flag your card as suspicious, causing a temporary block. Avoid multiple retries after a failed deposit.

Large first-time deposit – High initial deposits can trigger security alerts from your bank. Start with a smaller amount and increase gradually.

Location mismatch – If your current IP address differs from the country of your card-issuing bank, the transaction may be blocked.