I have deployed my application on Heroku and I have issues setting my custom domain name.
Here are my domains on Heroku :
Here are my targets set on OVH :
Still, I cannot access my website and the browser states that the website is not accessible with this error appended : DNS_PROBE_FINISHED_NXDOMAIN
There is a well written article on their site that outlines the steps:
Also, an important part is that your account is verified:
You can add custom domains to any Heroku app . . . you must verify your Heroku account to add domains to apps.