OMEMO does not work with several clients (Converse, Conversations, Dino, Gajim)

> grep -Ev '^$|^\s*#' ejabberd.yml
loglevel: 5
log_rotate_size: 10485760
log_rotate_count: 1
hosts:
  - "molgen.mpg.de"
certfiles:
  - "/home/ejabberd/conf/xmpp.molgen.mpg.de-key.pem"
  - "/home/ejabberd/conf/xmpp.molgen.mpg.de.pem"
ca_file: "/etc/ssl/cert.pem"
listen:
  -
    port: 5222
    ip: "::"
    module: ejabberd_c2s
    max_stanza_size: 262144
    shaper: c2s_shaper
    access: c2s
    starttls_required: true
  -
    port: 5223
    ip: "::"
    tls: true
    module: ejabberd_c2s
    max_stanza_size: 262144
    shaper: c2s_shaper
    access: c2s
  -
    port: 5269
    ip: "::"
    module: ejabberd_s2s_in
    max_stanza_size: 524288
    shaper: s2s_shaper
  -
    port: 5270
    ip: "::"
    tls: true
    module: ejabberd_s2s_in
    max_stanza_size: 524288
    shaper: s2s_shaper
  -
    port: 5280
    ip: "::"
    module: ejabberd_http
    request_handlers:
      "/ws": ejabberd_http_ws
      "/bosh": mod_bosh
      "/oauth": ejabberd_oauth
      "/api": mod_http_api
    captcha: false
  -
    port: 5443
    ip: 0.0.0.0
    module: ejabberd_http
    request_handlers:
      "/admin": ejabberd_web_admin
      "/api": mod_http_api
      "/bosh": mod_bosh
      "/upload": mod_http_upload
      "/ws": ejabberd_http_ws
    tls: true
s2s_use_starttls: optional
auth_method: ldap
ldap_servers:
  - "ldap.molgen.mpg.de"
ldap_encrypt: tls
ldap_rootdn: "cn=ejabberd,dc=ldap,dc=apps,dc=molgen,dc=mpg,dc=de"
ldap_password: "X"
ldap_base: "dc=user,dc=apps,dc=molgen,dc=mpg,dc=de"
ldap_filter: "(objectClass=molgenUser)"
shaper:
  normal: 1000
  fast: 50000
max_fsm_queue: 10000
acl:
  admin:
    user:
      - "admin@localhost"
      - "b@molgen.mpg.de"
  local:
    user_regexp: ""
  loopback:
    ip:
      - "127.0.0.0/8"
      - "::1/128"
      - "::FFFF:127.0.0.1/128"
shaper_rules:
  max_user_sessions: 10
  max_user_offline_messages:
    - 5000: admin
    - 100
  c2s_shaper:
    - none: admin
    - normal
  s2s_shaper: fast
access_rules:
  local:
    - allow: local
  c2s:
    - deny: blocked
    - allow
  announce:
    - allow: admin
  configure:
    - allow: admin
  muc_create:
    - allow: local
  pubsub_createnode:
    - allow: local
  register:
    - allow
  trusted_network:
    - allow: loopback
api_permissions:
  "console commands":
    from:
      - ejabberd_ctl
    who: all
    what: "*"
  "admin access":
    who:
      - access:
          - allow:
            - acl: loopback
            - acl: admin
      - oauth:
        - scope: "ejabberd:admin"
        - access:
          - allow:
            - acl: loopback
            - acl: admin
    what:
      - "*"
      - "!stop"
      - "!start"
  "public commands":
    who:
      - ip: "127.0.0.1/8"
    what:
      - "status"
      - "connected_users_number"
  
language: "en"
modules:
  mod_adhoc: {}
  mod_admin_extra: {}
  mod_announce: # recommends mod_adhoc
    access: announce
  mod_blocking: {} # requires mod_privacy
  mod_caps: {}
  mod_carboncopy: {}
  mod_client_state: {}
  mod_configure: {} # requires mod_adhoc
  mod_disco: {}
  mod_bosh: {}
  mod_http_upload:
    custom_headers:
      "Access-Control-Allow-Origin": "*"
      "Access-Control-Allow-Methods": "GET,HEAD,PUT,OPTIONS"
      "Access-Control-Allow-Headers": "Content-Type"
    put_url: "https://upload.@HOST@:5443/upload"
    thumbnail: false # otherwise needs ejabberd to be compiled with libgd support
  mod_last: {}
  mod_mam: # for xep0313, mnesia is limited to 2GB, better use an SQL backend
    assume_mam_usage: true
    default: always
  mod_muc:
    access:
      - allow
    access_admin:
      - allow: admin
    access_create: muc_create
    access_persistent: muc_create
    default_room_options:
      allow_subscription: true
      persistent: true
      mam: true
  mod_muc_admin: {}
  mod_offline:
    access_max_user_messages: max_user_offline_messages
  mod_ping: {}
  mod_privacy: {}
  mod_private: {}
  mod_pubsub:
    access_createnode: pubsub_createnode
    ignore_pep_from_offline: false
    last_item_cache: true
    plugins:
      - pep # pep requires mod_caps
      - flat
    force_node_config:
      eu.siacs.conversations.axolotl.*:
        access_model: open
      "storage:bookmarks":
        access_model: whitelist
  mod_push: {}
  mod_push_keepalive: {}
  mod_register:
    welcome_message:
      subject: "Welcome!"
      body: |-
        Hi.
        Welcome to this XMPP server.
    ip_access: trusted_network
    access: register
  mod_roster: {}
  mod_shared_roster: {}
  mod_vcard:
    search: false
  mod_vcard_xupdate: {}
  mod_avatar: {}
  mod_version: {}
  mod_stream_mgmt: {}
  mod_s2s_dialback: {}
  mod_http_api: {}
  mod_fail2ban: {}
allow_contrib_modules: true