Two Douyin accounts cannot be merged into one mobile phone number.

Extension: Two Douyin accounts cannot be bound to the same mobile phone number unless they are two versions, one is Douyin Express and the other is Douyin. Only one can be bound to the same account.

If you can log in to two Douyin accounts with one mobile phone, it cannot be bound to the same mobile phone number at the same time, because each mobile phone number can only be bound to one.