@Jeff P,Thanks for posting in Q&A.
To clarify this issue, please check the following.
1.Check whether the affected devices have met the requirement, also the csp on is only available for device scope.
2.Follow the link below to troubleshoot the error.
https://learn.microsoft.com/en-us/defender-endpoint/troubleshoot-microsoft-defender-antivirus
Please try above information, if there is any update, feel free to let me know.
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