Employee record not found in self-assessment

I have submitted the tax return by using HMRC portal in April 2023 for tax year 2022/2023. And I got the letter from HMRC in Dec 2023, they are not able to find my employee record. Therefore, the reported tax deducted amount is removed. I am wondering if it is related to my tax code is 0T and I did not complete the HMRC starter checklist because I did not have NI at that moment (First Job in UK). I have tried to send my P60 (Mar, 2023) and letter to the HMRC address on 5 Jan 2024 Should I expect any feedback for that? It is because I want to amend the tax return as I have reported the capital gain (around £4XX). I am wondering if it is necessary to report that because it is below the capital gain allowance. And in the letter, I also ask for the change of my tax code (0T) to normal one because monthly income tax is different? It would be great to hear any feedback and suggestion.

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