@Abu Shadat Sohab,Thanks for posting in Q&A.
I have done some research about this issue, this setting to take the risk assessment as a condition for compliance, it may be due to you do not enable Microsoft Defender for Endpoint. You can try enable Microsoft Defender For Endpoint for iOS to check whether the issue can be fixed.
https://learn.microsoft.com/en-us/mem/intune/protect/mtd-connector-enable
Or you can set requires the device to be under the device threat level medium to check whether the device is compliant.
If there is any unclear, feel free to let me know.
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