What does HRESULT 0x80320030 (FWP_E_INCOMPATIBLE_AUTH_METHOD) mean?

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The selected IPsec authentication method is not compatible with the policy type.

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FWP_E_CONTEXT_INCOMPATIBLE_WITH_CALLOUT	FWP_E_INCOMPATIBLE_DH_GROUP

FWP_E_INCOMPATIBLE_AUTH_METHOD

FWP_E_INCOMPATIBLE_AUTH_METHOD means an IPsec authentication method is valid in isolation but cannot be used with the selected policy type.

Review the policy type and the authentication methods configured for both endpoints.
Check that certificate, Kerberos, pre-shared-key, or other configured authentication is valid for the negotiation mode being used.
Capture IKE events while reproducing the failure to distinguish an invalid local policy from remote-peer negotiation failure.

netsh wfp show ikeevents file=-