Circe generic codec derivation for records with object keys

I'm trying to implement something like

object Claims {
  import shapeless._
  import shapeless.labelled.FieldType
  import io.circe._
  import io.circe.generic.semiauto._
  import java.util.UUID

  type ClaimOf[V] = FieldOf[V]
  object iss extends ClaimOf[String]
  object subj extends ClaimOf[String]
  object aud extends ClaimOf[Set[String]]
  object client_id extends ClaimOf[UUID]

  implicit val encoder =
    deriveEncoder[FieldType[iss.type, String] :: FieldType[subj.type, String] :: HNil]
}

It does not compiles with an error error: could not find implicit value for parameter encode: shapeless.Lazy[io.circe.generic.encoding.DerivedObjectEncoder[shapeless.::[shapeless.labelled.FieldType[Claims.iss.type,String],shapeless.::[shapeless.labelled.FieldType[Claims.subj.type,String],shapeless.HNil]]]] deriveEncoder[FieldType[iss.type, String] :: FieldType[subj.type, String] :: HNil]