kww24 Whitelam

I moved to France in October 2022 and completed the paperwork for moving abroad. My tax code was recently changed to NT and the HMRC app allowed me to reclaim an overpayment for 2022-2023. My pension provider has recently refunded my overpaid tax for this current tax year. However, I am unable to reclaim the overpayment for 2023-24. The app and the website both say that I have paid the correct amount of tax and neither allow me to make a claim for overpayment. What do I need to do to reclaim the overpaid tax for 2023-2024? Thanks.