Can't activate cloudflare domaine after deactivating it

I bought many domains through Cloudflare, I deactivated most of them to work on only one of them, now I can’t manage or reactivate the domain names, it says “404 | We can’t find the page you’re looking for.” when I try to add a new site using one of the domains too it says that the domain is not available.
please help

What does that mean? How did you/what did you deactivate?

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