Incorrect details submitted to Vinted HMRC Reporting

Hi all, I've been selling my old junk and unwanted goods which have been sitting in my house for ages on Vinted. So far I've sold about 50 items which have totalled to around £750. I got a notification about the HMRC Reporting centre on the Vinted app as soon as I clicked on the notification and clicked next - the app froze which caused me to keep pressing next a few time - only for the app to submit the report. I didn't manage to add my NI number or my details as the app froze, I contacted Vinted and they said they are unable to change the report. How do I go about this process? What should I do?

Hi,
HMRC cannot help you with the Vinted error. If you feel you need to report the income to us then you will need to complete a tax return. Please refer to guidance at:
Selling online and paying taxes - information sheet
Thank you