Late filing penalty in May, with no prior letter informing me to file self assesment

HMRC has issued me a late filing penalty in May 2024, stating I have missed the deadline to submit self assessment They did not issue any prior notice (either via email or letter) that I needed to file a self assessment. Further, the late filing notice was sent in May, after penalties have already accrued (rather than earlier in the year) Is this normal / legal? I have raised an appeal

Hi WayneViegas,
If the penalty is for the 2022/23 tax year, the notice to file the 2022/23 tax return is normally issued in April 2023.
If you did not receive the orignal notice to file and have included this in your appeal then when reviewed this will be taken into account. 
Thank you.