As you already know, Azure AD Conditional Access policies are one important component helping you securing access to your resources.
Implementing Conditional Access policies is sometimes a little bit complicated as it may impact the ability of your users to access those resources.
Well, good news, you can now enable a Report Only option when setting up Conditional Access, which basically is evaluating in live the conditions and actions but do not apply the actions.
The result of this Report Only is then available through the Sign In blade (available below the Monitoring section) when selecting a user account on which the policy should have been applied to