There are a few possible reasons why your application was unsuccessful. Some common reasons include:

• Joint CDP accounts cannot be used to buy T-bills. You will need to have an individual CDP Securities account as a holding account to deposit your allotted T-bills.
• Invalid or incorrect CDP account number entered during the application.
• The CDP account used does not have Direct Crediting Service activated.

In addition, please note that there is an allotment limit of S$1 million per individual per T-bills auction for non-competitive applications.

You may wish to check with your bank for the exact reason(s) why your application was rejected.