HRESULT 0x80320021 (FWP_E_INVALID_INTERVAL): meaning and diagnosis

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FWP_E_INVALID_INTERVAL means a Windows Filtering Platform time interval is malformed or outside the contract accepted by the operation.

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FWP_E_INVALID_RANGE	FWP_E_ZERO_LENGTH_ARRAY

FWP_E_INVALID_INTERVAL

FWP_E_INVALID_INTERVAL means a time interval supplied to WFP does not satisfy the requirements of the API or policy object that consumes it.

Verify the documented unit and representation for the interval field instead of assuming seconds or milliseconds.
Reject negative, reversed, overflowed, or unsupported interval values before making the WFP call.
When converting from another time type, preserve precision and validate the resulting range.