In the course of the service bank migration between 9 - 12 February 2023, your Transaction Account held with Starling Bank was automatically closed (and the Starling Bank Terms and Conditions were terminated), and a replacement Transaction Account was opened with ClearBank in your name.
Consequently, the account number and sort code you previously used when transferring money into your Transaction Account has changed. You can view your new account details by logging into your Raisin UK Account and viewing the details in the top right corner.