422
providers.unknown_adapterprovidersRule R7No adapter of that name is registered
A provider names the adapter that implements it, and adapters are compiled into the build. A name the build does not know cannot be registered, because nothing would be able to call it.
Why the API refuses
WHEN RegisterProvider is executed with an adapter that the project has not registered, THE SYSTEM SHALL reject it naming the adapter field.
What to do
Use an adapter the running build ships. A new adapter is a code change and a deploy, not a configuration entry.