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To answer your question, if you’re implementing Conditional Access policies, you need to ensure that every user that is affected by a Conditional Access policy needs to have a license that includes Conditional Access, such as Azure AD Premium P1 or P2.
Please see the overall Azure AD Pricing/Licensing doc found here:
https://azure.microsoft.com/en-us/pricing/details/active-directory/
The documentation also says, "Using this feature requires an Azure AD Premium P1 license", which means that it's required for any user who makes use of the feature.
Hope this helps. Do let us know if you any further queries.
Thanks,
Akhilesh.
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