If your company account enabled Epicor Identity for Epicor products, you may also use the same set of login credentials for Epicor customer portals and the enabled Epicor products.
For your quick reference, links include:
Epicor SSO for Epicor customer portals:
This service is available for enabled Epicor customer portals and products, but can only be set for a company’s users by the designated Epicor Application Administrator. General users cannot enable or disable their own MFA settings.