The 'Detected' state happens when AMT is active, but SCCM doesn't have the right credentials or PKI configuration to access it successfully. This can happen if:
1. The Discovery account in SCCM does not match the admin password of AMT
2. The system was provisioned by something other than SCCM and credentials haven't been imported into SCCM.
3. Credentials for AMT were lost somehow
Can you tell me how the systems were provisioned?