NetBanking  How to Find your Customer ID? If you are using a net banking facility, you will be very familiar with the Customer ID or User ID. The Customer ID is mentioned in the welcome letter and cheque book. It is also mentioned on the first page of Passbook and Account Statement.

Check Your Credentials. Check that you're using the right credentials. If you have multiple bank logins, make sure you haven't got them mixed up. It's a simple thing to suggest, but it's unsurprising how often the issue is an accidental capital letter or missed character.