Error Code: 8000015

I created a subdomain from Cloudflare for a project. but I have remove that project. During the removal Cloudflare warn me about that the domain will be free again.
After that I have created another project and wanted to re-assign the same subdomain for my project again.
But Cloudflare now shows an warning like: “This domain is reserved and unavailable for use. Select another domain. (Code: 8000015)”
How can I get the domain again?
how long will the domain keep reserved?

Hi @mithunhasan, can you share the domain?