Information barriers seem like a good idea. Implement policy-driven controls over who can communicate within a Microsoft 365 tenant. Microsoft is making the solution available to education tenants. In reality, they should spend some the engineering effort required to improve the current sad state of the information barriers solution. No GUI, horrible management, PowerShell with impenetrable errors, and a lack of visibility into how the solution works.
Office 365 Informatiom Barriers allow tenants to erect communication firewalls between different groups. Teams supports Information Barriers, but currently has a problem adding new guest accounts to team memberships. An easy workaround exists, but debugging what’s going on is difficult because of the lack of clues.