Set custom domain name for the new Developer Portal
When running API Management in Internal vNet mode it is not possible to access the Developer Portal over <your-api-management-instance-name>.developer.azure-api.net since it's not publicly accessible. We need to be able to set a custom domain name on the new portal, can you please add the new portal to the list of endpoints available for custom domain names.
We’re planning to provide full support around general availability of the portal.
Ian Lamon commented
Although we added a custom domain for the new developer portal, it did not update the 'New Developer Portal (Preview)' link so we cannot navigate to it from the Azure portal as an admin and publish it. When we navigate to the new custom domain directly in the browser we get the 'Developer portal has not been published yet.' error message.