Are you asking why the postal credit card cf transaction failed? Network connection problems, account information problems, banking system problems.

1. Network connection problem. When a postal card attempts to make a transaction, the network connection is unstable or disconnected, causing the transaction to fail. It is caused by geographical location or network service problems.

2. Account information issues. Incorrect account information, including insufficient account balance, frozen account, incorrect password, etc., may cause transaction failure.

3. Banking system problems. Failure or maintenance of the banking system can also cause transaction failure.