Domain Verification - Sub domains

In our environment, the application is installed on a subdomain, it would be great to be able to verify and use that subdomain.

For example: bitwarden.foo.bar.mycompany.com

What do you mean by “verify and use”?

And since you tagged your post self-hosting, does the “application” that you are referring to mean the server or a client?

I believe @bclingan is referring to Domain Verification which allows users to skip the SSO identifier step during login.

Is that correct?

Correct, so my user accounts are something like [email protected], however the only DNS I can verify is *.bar.company.com.