This Error Event is part of Set Registry Value Events.
Event ID · 120400
"Failed to set registry value"
Overview
The Failed to set value for registry name error message indicates that the Set Registry Value Action has failed to set the specified Windows registry value.
Solution
Verify the specified registry path at which the value had to be set. Ensure that the user whose credentials were used to access the registry has the necessary rights to create or modify the specified registry entry.
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