DNS Error

I have our root domain managed and hosted on vercel.

I'd like to configure a subdomain of this domain to be hosted by cloudflare.

I set the CName as suggested (Name: <my-subdomain) Target: <my-pages-name>.pages.dev) in my Vercel's DNS settings

When I go to "Custom domains" settings in my pages project, it shows the subdomain but says Inactive (Error) and when I go to the URL I see:

This site can’t provide a secure <my subdomain>.<my domain>.app uses an unsupported protocol.
ERR_SSL_VERSION_OR_CIPHER_MISMATCH


Do I need to do anything else to configure it?
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