1 SaaS provider - 1 app for SSO - Multiple Azure AD ?

Hi guys,

Let's say we are not a single company but a group with multiple companies, each having their own, independant, totally separated Azure AD tenant. In order to connect to a SaaS provider via SSO, each company could create an app registration in their own tenant.

Is there a way we could create a single SSO app (in one of the tenants) and have it redirect requests to other AAD tenants based on the domain name in the login email ?

Our goal is to have only one SSO app facing the SaaS provider for multiple Azure AD tenants.

Is it achievable with Azure built-in features ?

Any idea would be greatly appreciated !

Rgds,