The current behavior is that when you enable a Teams integration in one of the organizations , it is being enabled for every organization in the tenant. This is leading to organizations(companies) that are not supposed to have the integration to be able to connect to Dynamics via Teams. This is not noted in the official article https://docs.microsoft.com/en-us/dynamics365/teams-integration/teams-install-app
Proposing this to be noted in the article and product group to consider changing the behavior to be enabled on organization level.