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Microsoft Entra ID
A Microsoft Entra identity service that provides identity management and access control capabilities. Replaces Azure Active Directory.
19,389 questions
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You need to specify the Teams app as an exclusion in a policy
https://endpoint.microsoft.com/?ref=AdminCenter#view/Microsoft_AAD_ConditionalAccess/ConditionalAccessBlade/~/Policies
Have you created a policy already? If it is prompting and you haven't got a policy then you have 'security defaults' on. If you need more nuanced control over CA, then you need the CA policies setup.
https://learn.microsoft.com/en-us/microsoft-365/business-premium/m365bp-conditional-access