Heroku + Google Domains + Cloudflare Subdomain issue

DNS & Network
#1

Hi All,

I’ve successfully setup my main domain from Google domains on Cloudflare and setup my heroku app using the DNS target for both the root domain and the www.

I have a second heroku app with a subdomain of my app.

So on heroku I did the usual process.

1.Setup Custom Domain using “www” so “www,subdomain,mydomain,com”
2. I copied the DNS target

Cloudflare

  1. I created a CNAME with the name “www,subdomain” and target “DNS target from heroku”

The site works fine if I type “www,subdomain,mydomain,com” but when I remove the “www” and try “subdomain,mydomain,com” it throw a site can not be reached and a DNS_PROBE_FINISHED_NXDOMAIN

Do I need to create another CNAME with out the “www” such as CNAME , subdomain , heroku dns target?

Or should I create a rule?

Not sure what to do.

#2

Update.

I was able to get it to work by creating two domains in heroku and creating corresponding CNAMEs on Cloudflare. Now weird issue I’m facing is I can access my site fine from my cell using cellular network but I can’t access it using wifi unless I use manual DNS server such as googles 8.8.8.8/8.8.4.4. Any idea why that is?