The access control option

Most organizations allow their users' mobile devices to access the organizational system. This can help your users work better when they are remote or mobile. This is something we believe should be encouraged, but we also believe and highly recommend that you, as the admin, and your organization should secure your data. In this section of the SharePoint admin center, you can set some of the settings needed. This is a fairly new section; expect it to evolve over time:

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