Hi @robcool , the "unknownFutureValue" status in the report-only data for a conditional access policy indicates that the policy was evaluated, but the result is not one of the four possible values defined by Azure AD. This can happen if the policy includes conditions or controls that are not yet supported by the report-only mode.
In general, you don't need to be concerned about the "unknownFutureValue" status in the report-only data, as it does not indicate a failure or security issue. However, if you see a large number of hits with this status, it may be worth reviewing the policy to ensure that it is configured correctly and that all conditions and controls are supported in report-only mode.
Please let me know if you have any questions and I can help you further.
If this answer helps you please mark "Accept Answer" so other users can reference it.
Thank you,
James