Proconnect doesn't accept Code 454110 on Sch C

454110 - Electronic Shopping and Mail-Order Houses
This industry comprises establishments primarily engaged in retailing all types of merchandise using nonstore means, such as catalogs, toll free telephone numbers, or electronic media, such as interactive television or the Internet. Included in this industry are establishments primarily engaged in retailing from catalog showrooms of mail-order houses.

This industry is being updated to eliminate the distinction between physical store and online store given the increasing prevalence of internet usage and generic method of delivery for goods and services, and instead distinguish between retailers specialized by broad product lines.

https://www.bls.gov/respondents/ars/electronic-shopping-and-mail-order-houses.htm

From  Schedule C instructions:

For nonstore retailers, select the PBA code by the primary product that your establishment sells. For example, establishments primarily selling prescription and non-prescription drugs, select PBA code 456110 Pharmacies & drug retailers.