Could not add subdomain into Cloudflare

I am trying to add a domain to Cloudflare. The portal prompts me with “Please ensure you are providing the root domain and not any subdomains (e.g.,, not”.

But my colleague running with the Cloudflare enterprise account could add this subdomain without getting any error. Could anyone explain this? Thanks.

A feature to add a sub-domain without adding a root domain requires at least a Business account:

Otherwise, maybe you could use your sub-domain as a SaaS with your colleague:

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