Using custom domains with Auth0

I’m trying to setup pritunl with Auth0 as the IdP. We also have a custom domain that is mapped to our Auth0 tenant which we’d like to use as all our social flows are built with the custom domain in mind. However, pritunl doesn’t accept the custom domain instead forcefully adds the .auth0.com after whatever the sub-domain value is. Is there a way to bypass this?

Only auth0.com sub domains are supported.