To be eligible for verification, an account also has to have a completed profile — with a name, a bio, a profile photo, and at least one video — and it has to be secured with multifactor authentication and a verified email. Plus, an account also has to have been used in the past six months to be verification-worthy.
The good news, at least, is that it doesn’t cost money to be verified — so don’t be fooled by scammers trying to sell TikTok verifications.
Source: https://www.distractify.com/p/what-does-the-blue-check-mark-mean-tiktok