Is a self-assessment tax return required to pay class 2 voluntary NIC?

Hi, I'm not a UK resident but I used to be and I still have some UK income that has been taxed in the UK. I don't need a self-assessment tax return according to https://www.gov.uk/check-if-you-need-tax-return and HMRC hasn't requested one this year. I've requested to pay class 2 voluntary National Insurance contributions and the request is still in progress. Do I have to send a self-assessment tax return while this request is in progress? Do I need to keep sending self-assessment tax returns as long as I pay class 2 voluntary National Insurance contributions, if I don't meet any other conditions that require it? Thanks!

Hi, Could I please get an answer? Thank you!