if you see "Server is currently unavailable please try again later" error, throw the account. You'll get banned!

Okay, I thought it was just a server error but, they know.

1. Reset iPhone,
2. Set timezone and languge to US, english
3. Set up a fresh VPN
4. Reset IDFA,
5. Clear Keychain entries
6. Install Tiktok from US store
7. Create an account, when it asks you to set up a name, choose anything and it'll throw "Server is currently unavailable please try again later"

You can't choose a username. They know. I'm a software dev and know many things in apple, so I know they know my device.
Even if you skip setting up a username, they won't let you upload profile picture, edit nickname or real name.
I waited 4-5 days to warm up the account, they banned me without posting anything.

Those steps works if you have a new iphone so don't suggest me to use esim.
I've read that tiktok uses a unique id called cid so none of precautions works.

Anyone had the same problem?