Hi , thanks for getting in touch. You will receive a message on screen advising your computer is unrecognised from time to time and this is due to the cookies being cleared from your web browser; this is how we recognise a customer’s device. Normally when this message pops up you should be able to continue your log in by requesting a One Time Access Code to your mobile phone or landline. What would prevent you from completing this process would be part of your security being locked.
We can send you a Temporary Security Number (TSN) through the post which will reset your online banking and allow you to get logged in again. This can take between 3-5 business days to arrive and will be valid for 30 days – if you would like me to arrange this for you, please message us @
Tesco-Bank with your full name, DOB and postcode.
Alternatively, you can call our Online Helpdesk anytime on 0345 300 3511 and request a TSN to be sent by text immediately once security is completed.