Custom Hostnames

Hello, I'm trying to setup Multi-Tenant SaaS where users can point their custom domains to my website's subdomains.

So for example, for user "Demo", their custom domain would be : https://demo.heliup.xyz

If that user has their own custom domain, for example https://astralics.com, they should be able to point that domain to the subdomain on my website.

Now, I've setup the CNAME records for astralics to point to https://demo.heliup.xyz ,

Then I went to the dashboard of the main website (heliup.xyz) to setup custom hostnames, And then I verified everything, but when i try to visit https://astralics.com it shows a Invalid SSL certificate Error code 526. I don't know what to do at this point, any help is greatly appreciated.
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