I am not a U.S. citizen or tax resident, but my TikTok account only shows the W-9 form for payout setup. I believe I should submit a W-8BEN form?

If you are not a US Citizen or Tax Resident, you would need to file form 1040NR. TurboTax does not support the 1040NR, but our partner Sprintax does and can help with your non resident return.