PKCE with Device Authorization doesn't work for me

Questions OAuth/OIDC
1

Is this expected?

I’m using the Classic Identity Engine. The option to use it is checked.
However, even though I send the code_challenge to the device/authorize endpoint, when I send the code_verifier to the v1/token endpoint (the second step of the flow) I get this error: “PKCE code challenge should be specified in the authorize request for code verification.”

Should PKCE work with this flow? This is for a native CLI application.

2

I don’t believe PKCE is compatible with the Device Authorization flow. The RFC states that the Device Authorization endpoint

is separate from the OAuth authorization endpoint defined in [RFC6749] with which the user interacts via a user agent (i.e., a browser).