Server Side Custom domain configuration

[Nando Merino]

I have followed the steps of the Google documentation to configure the custom domain for Google Tag Manager Server Side () I have correctly configured the DNS (attached screenshot), in the App Engine section it shows me the following information (attached screenshot) and when I access To verify that the domain is working correctly in GTM, nothing loads and it gives me the following error:



Does anyone have experience with this and can tell me if I need to do any extra steps or tell me if I have something wrong?

Thank you.

[babdelrahman]

You could try re-configuring (remapping) the custom domain.

If that doesn't work, kindly provide us with more details on the issue and which documents did you follow.

[Nando Merino]

I follow this steps: https://developers.google.com/tag-platform/tag-manager/server-side/custom-domain 

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[Felipe Bergallo Corral]

Hey, I do believe those are the right steps but the screenshots you've attached state that the DNS configuration isn't properly configured - it says that the registry of the Certificate Authority Authorization of your domain has denied the activation of the certificate. 
If I visit metric.das.es, it does not provide a certificate (in addition to the HTTP 400 error that I encounter) - unlike das.es which does provide a valid certificate. I've also noticed that das.es has had its certificate updated on February 8th - I'm not sure if metric.das.es has.