Free trials don't have Claude code. Did someone else get your access to your account maybe?
If you didn't do anything then appeal it.
Discussion
I appealed it but I am not waiting around. I already made a chatgpt business account. I need to keep development going and Claude code with Opus was as good as I needed for my project. The free trials and even Claude Pro was not enough. Let's see how chatgpt and codex behaves now... 😉