Do I need to file returns for previous years?

Hi, While I have never previously been required to file a self assessment return, after moving in with my Partner I now need to file a return for 23/24 due to the high income child benefit charge. Since registering for self-assessment, I have subsequently received communication from HMRC asking me to file returns for 20/21, 21/22 and 22/23, all of which show on my gateway when I log in as outstanding. Do I now, need to file returns for these periods even though the only one required is the 23/24 year? If i do need to file returns for these periods, will I now receive penalties for filing these late even though I was not even registered for self assessment in time to file these returns (nor had a requirement to do so)? Thanks

Hi,
You will need to contact HMRC to check why the notice to file the tax returns was issued and review if due Self Assessment: general enquiries.
If a notice is sent out late to file a Self Assessment tax return then you will be given 3 months and a week to file the Self Assessment before late filing penalties are charged. 
Thank you.