Furthermore, in case you believe this is a Cloudflare issue, you should be able to see the challenged or blocked event under the Security tab → Events at Cloudflare dashboard for your zone and know exactly which security option was triggered.
Once you find them, click on a particular one to find more details about it (user-agent, IP, HTTP version …). If yes, could you share some details which service was triggered that blocked you?
Wonder if you’ve got the “Block AI Bots” feature enabled at Cloudflare dashboard and if that’s causing such result
Nevertheless, Bot Fight Mode might be blocking Bytedance, since it’s not on the Verified Bot list: