Website hosting on the cloud and subdomain hosting from home

I’m hosting the website on the cloud provider and I would like to host some of the internal resources from the Cloudflare Zero trust. I have pointed out my website name with the hosting provider’s IP address. The website is working fine but when I go to Zero Trust Tunnels and create a public host name page (subdomain field as * and root domain name) it won’t let me create it due to the DNS name already existing.