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Does the sub-domain have got an SSL certificate? If not, you would need to generate one.

Kindly, see here why your SSL not working for your sub-domain:

Deprecated - SSL/TLS not working on subdomain

This tutorial is deprecated in favour of Troubleshooting · Cloudflare SSL/TLS docs

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Please note, this tutorial post contains links to external sites. I am not endorsing any external links. This tutorial post covers the first steps you should take if SSL is working on your main domain, but not on a subdomain. 1. Is there a DNS record for it? Check the DNS app in your Cloudflare dashboard to see if there is a DNS record there for that subdomain. 2. Check that the DNS record is working co…

Nevertheless, follow the steps from this tutorial regarding an SSL certificate:

Deprecated - Step 2: Setting up SSL with Cloudflare

This tutorial is deprecated in favour of Get started with SSL/TLS · Cloudflare SSL/TLS docs

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This tutorial covers getting SSL working with Cloudflare in various different scenarios. This assumes you already have your website set up on Cloudflare with all your DNS records set to , if not - please visit <a href="https://community.cloudflare.com/t/64309">Step 1</a>. Do you want the website to use HTTPS? Yes Do you already have a valid SSL certificate installed…

Moreover, what kind of SSL option have you got selected under SSL tab/settings page at Cloudflare dashboard for your domain?

• Flexible SSL, Full SSL …

Deprecated - SSL/TLS app Settings

This tutorial is deprecated in favour of Get started with SSL/TLS · Cloudflare SSL/TLS docs

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SSL/TLS Configuration Video: This tutorial covers basic settings in the SSL/TLS app of the Cloudflare Dashboard, including SSL Mode [Off/Flexible/Full/Full (Strict)], Cloudflare Origin Certificates, ‘Always Use HTTPS’ and ‘Automatic HTTPS Rewrites’. The settings covered here can all be found by visiting <a href="http://Cloudflare.com">Cloudflare.com</a>, logging in, selectin…

Is your sub-domain A or CNAME record being cloud or cloud?

Deprecated - Troubleshooting SSL/TLS issues

This tutorial is deprecated in favour of Troubleshooting · Cloudflare SSL/TLS docs

Archive

This tutorial post covers the steps you should take if you have enabled Cloudflare, but HTTPS is not working on the site. If your main domain is secure, but a subdomain is not, please see <a href="https://community.cloudflare.com/t/ssl-tls-not-working-on-subdomain/75181.">https://community.cloudflare.com/t/ssl-tls-not-working-on-subdomain/75181.</a> 1. Check that the DNS record is se…

Also, I got an redirection loop error and regarding the redirection loops, kindly check the steps from the below article:

Community Tip - Fixing ERR TOO MANY REDIRECTS

Error Try the suggestions in this Community Tip to help you fix ERR TOO MANY REDIRECTS. Background If your SSL setting on the SSL/TLS app is Flexible and if your origin server is configured to redirect HTTP requests to HTTPS, server responses back to Cloudflare are encrypted. Since Cloudflare is expecting HTTP traffic, it keeps resending the same request, resulting in a redirect loop. This causes browsers to display “The page isn’t redirecting properly” or “ERR_TOO_MANY_REDIRECTS” errors. [D…

https://support.cloudflare.com/hc/en-us/articles/115000219871-Troubleshooting-redirect-loop-errors-