Couple of key points for now - e.g. companyA = Office365, companyB = GSuite - Both companies on separate domains and no immediate need to migrate to one - Ideally we for now we don't NEED to have them all using Office365 or all using GSuite HOWEVER, it would be good for companyA.com to occasionally log into company B's GSuite managed services and visa versa
So, I was wondering if it would work doing federated login between both systems so that companyA can log into a system using Google sign in via their own companyA.com email and a companyB user could log into an Office 365 system using their companyB.com email?
Is this doable or am I dreaming?