Microsoft Teams becoming an unrivaled communication platform its been adopted by most of the corporate organizations right from small, medium and large scale businesses.
Teams adoption rate have been thriving a lot and there are organizations managing their daily operations and projects completely via better organized Teams and channels.
In this article we will have an overview and the options available to expose Microsoft Teams for communication to the external network and other office 365 organizations.
As an initial prerequisite we must ensure that all the Office 365 URL and IP Ranges are allowed.
Login to Microsoft Teams Admin center portal here we have 2 options.
- External Access
- Guest Access

For external access the screenshot is pretty much explanatory. The best way is to add only the allowed domains which would block the other external organizations.
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