What does HRESULT 0xC03B0019 (HNS_GUID_CONVERSION_FAILURE) mean?

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Description:

Host Networking Service could not interpret a supplied value as a GUID.

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HNS_SHARED_SWITCH_MODIFICATION	HNS_REGKEY_FAILURE

HNS_GUID_CONVERSION_FAILURE

HNS_GUID_CONVERSION_FAILURE is an HRESULT used by Windows Host Networking Service (HNS). It indicates that an identifier has an invalid format or was supplied in a field that expects a GUID.

What to check

Validate GUID strings before sending the HNS request and preserve their canonical format.
Check that names, IDs, and JSON properties were not accidentally substituted for one another.
Log the field name and sanitized input value to locate the invalid configuration source.

Microsoft documentation on Windows container networking and HNS

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