Cannot produce message for exchange of type fanout.

Unfortunately I can't send messages to an Exchange configured as type fanout ... inequivalent arg 'type' for exchange 'user.events' in vhost '/': received 'topic' but current is 'fanout'. In the documentation I can't find a parameter where I can configure the type. Is fanout not supported or am I missing something?

krakend.json

{
  "version":3,
  "port":8080,
  "endpoints":[
    {
      "endpoint":"/api/user/event/signedUp",
      "method":"POST",
      "backend":[
        {
          "extra_config": {
            "backend/amqp/producer": {
              "name": "user.event.UserSignedUp",
              "exchange": "user.events",
              "durable": true,
              "delete": false,
              "no_wait": true,
              "no_local": false,
              "routing_key": "userSignedUp",
              "prefetch_count": 10,
              "mandatory": false,
              "immediate": false
            }
          },
          "host":[
            "amqp://guest:guest@host.docker.internal:5672/"
          ],
          "disable_host_sanitize":true
        }
      ]
    }
  ]
}

KrakenD

krakend_ce_1 | 2022/04/25 14:15:52 KRAKEND ERROR: [ENDPOINT: /api/user/event/signedUp] Exception (504) Reason: "channel/connection is not open"
krakend_ce_1 | [GIN] 2022/04/25 - 14:15:52 | 500 |     293.667µs |      172.26.0.1 | POST     "/api/user/event/signedUp"

rabbitMq

rabbitmq | 2022-04-25 14:15:52.230932+00:00 [error] <0.4687.0> Channel error on connection <0.4678.0> (172.28.0.1:64784 -> 172.28.0.2:5672, vhost: '/', user: 'guest'), channel 1:
rabbitmq | 2022-04-25 14:15:52.230932+00:00 [error] <0.4687.0> operation exchange.declare caused a channel exception precondition_failed: inequivalent arg 'type' for exchange 'user.events' in vhost '/': received 'topic' but current is 'fanout'

krakend / krakend-amqp

Cannot produce message for exchange of type fanout. #14