Wireguard Client - No tunnel

Hello,
I’m setting up an wireguard server at my.endpoint.com and will connect HA over the wireguard client app (GitHub - bigmoby/addon-wireguard-client: Hassio App (or add-on) Wireguard Client · GitHub).

I add the parameters along my configuration file for an client from my server. The problem, no tunnel to the server is created. At the log-file of the app no error occurs.

What is wrong on my configuration? Any ideas?

api_bind: 127.0.0.1
interface:
  private_key: ....=
  address: 10.8.0.3/24
  dns:
    - 1.1.1.1
  post_up: >-
    iptables -t nat -A POSTROUTING -o wg0 -j MASQUERADE; iptables -A FORWARD -p
    tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
  post_down: >-
    iptables -t nat -D POSTROUTING -o wg0 -j MASQUERADE; iptables -D FORWARD -p
    tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
  mtu: 1420
peers:
  - public_key: ....=
    pre_shared_key: ....=
    endpoint: my.endpoint.com:51820
    allowed_ips:
      - 10.6.0.0/24
      - 10.8.0.0/24
    persistent_keep_alive: 25
    dns: []
failover:
  enabled: false
  ping_ip: ''
  check_interval: 60
  handshake_threshold: 150
  max_failures: 3
  revert_interval: 900
log_level: debug