My Subdomain not working

My domain is working properly, but unfortunately my subdomain (website shows, but not secure) is not working. My subdomain (ex. was added to Cloudflare as:
TYPE A NAME shop VALUE TTL Automatic.
From what I see I did everything correctly, but it is still not showing secure. Can anybody help me?

Without being able to examine the site, all I can suggest is to test it here:

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