How to point a client's subdomain to Cloudflare and then to origin?

Hi there, we want to achieve the following:
subdomain.client.comsubdomain.our-domain.comour-app.up.railway.app

Right now, we instructed our client to create a CNAME subdomain.client.comsubdomain.our-domain.com
And we have in our Cloudflare this CNAME subdomain.our-domain.comsome-app.up.railway.app

But the problem arises when we turn on the Cloudflare proxy for the CNAME subdomain.our-domain.comsome-app.up.railway.app. With the Cloudflare Proxy, we get ERR_SSL_VERSION_OR_CIPHER_MISMATCH when visiting subdomain.client.com in the Chrome-based browser.
Everything works fine without Cloudflare proxy, but we want to use Cloudflare’s features.

The SSL/TLS encryption mode is Full, and we have no Page Rules set.

Is it possible to have this setup with Cloudflare proxy turned on, and how can we achieve it?

Cloudflare for SaaS is what you’re looking for:

That mode should really never be used, only Full (strict).

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Thank you, I’m looking into Cloudflare for SaaS and seems like we need!

As far as:

That mode should really never be used, only Full (strict).

Any explanation on why Full should never be used?

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