Hello @maxinehaysgd,
Please be advised that you'll need to visit your nearest branch with your ID booklet and bank card or get to your nearest atm in order to change your pin there. Changing your pin from 4 to 5 numbers will need you to input your old pin before you can amend to a new one. Once this is complete, you can attempt to register for the online and mobile banking again.
Kind Regards,
Mandy
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