You may already be aware of this security feature called Azure AD Conditional Access helping you protecting and securing access to your resources published through Azure AD.

A new capability to this feature has been added (in preview) to provide a better reporting and troubleshooting capabilities: Azure AD Conditional Access Sign-Ins Report

To start using it, logon to your Azure AD administration portal – either from the Azure portal (https://portal.azure.com) or from the Azure AD Portal (https://aad.portal.azure.com) and reach the Sign Ins section (below the Activity)

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Then select the sign-in activity you want to review/troubleshoot;

Once you have selected the sign-in activity you want to review, all the details related to it are displayed below, in the Summary activity section

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From the you can then browse to the Device Info, MFA or Conditional Access to review and probably troubleshoot it

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