@Philip Garza, Thanks for posting in Q&A. From your description, I know the AOSP enrollment is failed with error "Device Platform blocked". After reviewing the list of Android Open Source Supported Devices, I find Audiocodes model C470HD: is not in the following support list. Therefore, we will get this error.
https://learn.microsoft.com/en-us/mem/intune/fundamentals/android-os-project-supported-devices
Meanwhile, for this model, based on my checking, I find it isn't in Android Enteprises supported device list either.
https://androidenterprisepartners.withgoogle.com/devices#
Note: Non-Microsoft link, just for the reference.
As Android device administrator enrollment is ending support.
https://learn.microsoft.com/en-us/mem/intune/enrollment/android-enroll-device-administrator
For your device, we suggest MAM management instead of MDM management.
https://learn.microsoft.com/en-us/mem/intune/fundamentals/deployment-guide-enrollment-mamwe
Hope the above information can help.
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