Jakub Batkiewicz

Hi, I have been a Foreign student Who has been Living and working in UK from september 2017 till june 2020. Most of this Time I Was working Part Time and all my taxes were taken through PAYE. When I finished university in june 2020 I left my job and then came back to my original Country, Poland. All this Time Never had to talk to HRMC or send any other forms. I have my NINO number for which I applied through jobcentre. Recently I learned for the First Time of P85 form that supposedly was needed to be sent at the Time of leaving UK (didnt notify HMRC of my leave). As of now I dont ever plan to Return. What should I do as of now? Send the p85 4 years after the fact? Or maybe notify HMRC of my current address and contact? I guess some letters May have arrived at the old address in UK where I Was renting at the Time, but mever reached me. Tried to Access the HMRC app but it keeps giving Me message "unable to verify identity, information does Not match the records". Since june 2020 I had no Ties to UK, no income in UK. I Am not worried about claiming any overpaid tax, rather if anything during this Time came up that needed to be addressed and possibility of penalties. What should I do in my situation?