Only some subdomains work

I have succesfully added my domain to Cloudflare.

I also have added some subdomains, following the guide at

Some subdomains works; some of them don’t.

For the ones that don’t work the browser displays the error

I have inspected the configuration of the subdomains and it looks exaclty the same, both in the hosting provider (Siteground) and in Cloudflare.

One important remark is that the subdomains that work were automatically discovered and added by Cloudflare in the DNS section, while the ones that don’t work, I had to add them manually

What could I check more?

Sorry, it seems I was too in a hurry. The DNS propagation needs some time. After a while, also the newly added subdomains work. I apologize for the inconvenience.

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