The HSN codes are directly blocked by the GST portal according to the annual turnover. Please note that if you are receiving this error then it is directly coming from the portal.
If you are receiving such errors, try entering the 6 or 8-digit HSN codes and then attempt to create the E-invoice.
Additionally, some 6-digit HSN codes are not identified by the e-invoice portal, though they are valid. So, in that case, you may use the 8-digit HSN code after consulting with your CA.
Please verify the HSN codes from this link: