What does HRESULT 0x80320032 (FWP_E_EM_NOT_SUPPORTED) mean?

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An IKE policy attempted to include an unsupported Extended Mode policy.

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FWP_E_INCOMPATIBLE_DH_GROUP	FWP_E_NEVER_MATCH

FWP_E_EM_NOT_SUPPORTED

FWP_E_EM_NOT_SUPPORTED means the selected IKE policy includes an Extended Mode policy that the WFP IPsec policy model does not allow.

Review the policy construction path and remove unsupported legacy-policy combinations.
Validate the policy model against the Windows IPsec APIs used by the application or deployment tool.
Capture IKE events only after the local policy can be accepted; this HRESULT occurs before a valid negotiation configuration exists.