1. It may be that the account number is illegal, which makes it impossible to change the name normally. It is recommended to contact Tik Tok customer service to help lift the restrictions.

2. the name may have been changed once before, so it can't be changed, because Tik Tok can only be changed once at most, and it can't be changed the second time.

At present, the network signal is not good. It is recommended to try a place where the network signal is stable.