Can you have users from two identity domains for OTM

Summary:

Customer has enabled SSO and employee users are managed through an identity domain.

Content (please ensure you mask any confidential information):

Non employee users are not part of this identity domain. Customer has created a separate identity domain for non employee users and want to provide them OTM user roles and manage their access through this second identity domain. Is this possible?

Version (include the version you are using, if applicable):

OTM 24C

Code Snippet (add any code snippets that support your topic, if applicable):