how is K_enc produced?

[Kxuan]

The document says:

Once key confirmation is complete, applications MAY use K_enc as an authenticated shared secret as needed. For example, applications MAY derive one or more AEAD keys and nonces from K_enc for subsequent application data encryption.

But the document does not explicit says how to produce K_enc.

[ttaubert]

Thanks! Those K_enc references need to be removed indeed.