Option to disable the possibility to switch tenants
With all the security and compliance options offered by Microsoft 365 and Teams, it is currently not possible to prevent a user from switching to another tenant and saving documents, texts or other stuff. It happens completely unseen and not even logged.
Yes it is possible to use a web proxy for this purpose (https://docs.microsoft.com/en-us/azure/active-directory/manage-apps/tenant-restrictions). But this is a strong intervention in the infrastructure and a disproportionate effort for the problem. Furthermore it is of course possible to intercept the invitation mail to the user, but if the user has already been invited I'm unlucky.
Teams needs a possibility for the admin to control the exchange with other tenants and to stop it if necessary.
There is a huge risk of data leakage and this should be avoided as much as possible.
Similar Feature request with more votes: