I have setup a GTM server side container for a client and currently trying to add a custom domain.
The DNS records have been added and the certificate has also been created but when I try to open the debug view with the custom domain, it says page not found.
I also reviewed the Cloud Run for another GTM server container and this one and the server-side-tagging was absent in the previous one which is working fine with a custom domain.
I used the automatic provisioned tagging in both cases but unsure how the difference occurred.