QuickBooks keep asking me for article of incorporation to verify my identity, I don't know to tell them I'm a sole-proprietor, I don't have an article of incorporation.

Hi kehindedipo-k-d,

Welcome to Community!  Making sure you're able to proceed with QuickBooks Online for your business needs is vital.  In this situation, I encourage you to contact our Customer Care team at 1-833-317-2226, Mon-Fri: 9am-8pm ET.  They will be able to work with you in real-time, and ensure you're back to business as soon as possible!

If you have any other questions, feel free to reach out again.  We would be glad to help!