We have a multilingual site (EN/FR) hosted on Azure and routed using Azure Front Door

The domain for the site is are similar to the following (I've changed the domains because it is a public forum, so they won't work):

prod.domainname.com

In Umbraco, the domains set under Culture and Hostnames are as follows:

• Domain: / Language: English (Canada)
• Domain: /fr-ca Language: French (Canada)

The site works fine, EXCEPT when we generate the RSS feed in Razor, where it builds the using the Azure url, rather than the domain name, with a url like:

https://appwebsite.azurewebsites.net/news/

We want it to point to a url like this:

https://prod.domainname.com/news/

Is there somewhere in Umbraco Settings or backoffice where we can force it to use the url we want?

Or, is there a way in Razor to make the news feed pick the correct url. The links elsewhere on the site resolve correctly... The RSS feed uses to discover the link.

@Model.Url(mode: UrlMode.Absolute)