New profile change name

I created a new tiktok profile, I want to change my name, not the username but the name, it doesn't allow me, it says that it must take 7 days, and the username allows me to change

why is that, is that something wrong with my account?

if he doesn't allow me to change my name, why does he allow me to change my username? i always had some problems with this app, thanks in advance