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I tried to add a domain, but was told it was currently in use by another app When attempting to add a custom domain, the command returns an error that the domain is "currently in use by another app."
Why do I need to have a verified account for a free add-on or custom domain? You attempted to add a free third party add-on or custom domain but have been rejected due to having an 'unverified' account.
How do I connect a domain to my Heroku app? You want to connect a domain or domains to your Heroku app. (Or your domain isn't working.)
Redirect herokuapp domain to custom domain You want to redirect your default `herokuapp.com` domain to your custom domain.
Why don’t I see my site when I access my custom domain? When you access your custom domain you don't see your Heroku application.
Why am I redirected to a different URL when accessing my custom domain? When you access your application via its custom domain you are redirected to another URL
Will I need to reauthorize Heroku Connect after enabling My Domain/Enhanced Domain features for Salesforce? Salesforce will begin to require all Salesforce orgs to use a My Domain deployed by the Winter '22 release and enable enhanced domains by the Summer '22 release. Will I need to reauthorize Heroku Connect after enabling My Domain/Enhanced Domain features for Salesforce?
My root domain isn’t working, what’s wrong? User is having trouble pointing their root domain (aka apex domain/naked domain) to their Heroku app, either with setting the right DNS records, or accessing it over HTTPS. A DNS Provider does not allow setting `ALIAS`, `ANAME`, or `FLATTENING` Records
Is there any Heroku Add-ons changelog? I want to see a chronological list of Heroku add-ons like Heroku Changelog, but I can't find it.
Why can't I access herokudns.com CNAME endpoints in my browser? After setting up a custom domain, visting the associated ` .herokudns.com` address in my browser shows "There's nothing here, yet."

Dev Center articles 3

Custom Domain Names for Apps Make your apps accessible via custom domain names.
Mailer To Go Mailer To Go allows you to send emails automatically from your Heroku apps using your own domain.
Quick Start: Heroku Connect CLI This guide helps you set up the Heroku Connect add-on via the Heroku CLI and the Heroku Connect CLI plugin.

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