We want to make everyone aware of an upcoming change to the default setting for Guests in Microsoft Teams. With the large increase in organizations looking to use Teams to expand collaboration beyond the boundaries of their tenant, we want to make it easier for customers to get started. This has also been announced in Message Center post MC234252.
As a result, starting on February 8th we are turning on Guest access in Microsoft Teams by default for any customers who have not already configured this setting. This will bring the control for Teams Guest capability into alignment with the rest of the suite, where the setting is already on by default.
When this change is implemented, if you have not already configured Guest access capability in Microsoft Teams, that capability will be enabled in your tenant. With guest access enabled, you can provide access to teams and other resources to people outside your organization while maintaining control over your corporate data.
Prior to this change taking effect beginning on February 8th, if you want Guest access to remain disabled for your organization, you will need to confirm that the Guest access setting is set to "Off" instead of "Service default". Instructions for how to configure the Teams guest access settings can be found here: Teams guest access settings
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