SSO Across Multiple Custom Domains in Same Tenant

Hi @jmussman
Thanks a lot for the reply and detailed information.
We have a similar question that was raised earlier this month here.

In our setup the custom domains are under the same top level domain, but one is a subdomain, e.g:
identity[dot]company[dot]com and app1[dot]identity[dot]company[dot]com

Would it be possible to have SSO working in this case?

Regards,
Simon