嗨！

您可以使用条件访问来实现。您将创建一个新的条件访问策略，将其定位到访客用户，将其定位到Microsoft团队并强制执行MFA。

You would do that using Conditional Access. You'll create a new Conditional Access policy, target it to Guest users, target it to Microsoft Teams and enforce MFA.

外部用户必须首次在您的租户中注册MFA他们访问它。

External Users will have to enroll into MFA in your tenant the first time they access it.