How to use Outlook add-in with an internal domain?

Question

Hello,

We are developing an Outlook add-in using the instructions at https://learn.microsoft.com/en-us/office/dev/add-ins/develop/create-sso-office-add-ins-aspnet. We have successfully tested it for localhost and now need to test it on our internal domain.

According to Azure registration requirements, "Application ID URI" must contain a verified domain(api://<fully-qualified-domain-name>/<app-id>) in order to work on our internal domain. Is there any way to run the add-in without verifying a custom domain?

It is strange that Redirect URI does not need verified domain validation, but Application ID URI does.

Thank you for your help.