Patroni with etcd starting up

I have an existing PostgreSQL cluster v11.5 with streaming replication. I want to set up high availability managed by Patroni. I installed Patroni on both machines, I set up an etcd cluster on three others Virtuals Machines ['http://10.A.A.191:2379 ', 'http://10.B.B.99:2379 ', 'http://10.C.C.170:2379 '] but Patroni starting failed with systemctl. When I start Patroni with patroni -c /etc/patroni.yml command, I have the errors below:

-12-26 16:51:38,207 DEBUG: New etcd client created for http://127.0.0.1:4001 
2019-12-26 16:51:38,207 DEBUG: Selection next machine in cache. Available machines: ['http://10.A.A.191:2379 ', 'http://10.B.B.99:2379 ', 'http://10.C.C.170:2379 ']
2019-12-26 16:51:38,207 INFO: Selected new etcd server http://10.C.C.170:2379 
2019-12-26 16:51:38,208 DEBUG: Converted retries value: 0 -> Retry(total=0, connect=None, read=None, redirect=0, status=None)
2019-12-26 16:51:38,208 DEBUG: Starting new HTTP connection (1): 10.C.C.170:2379
2019-12-26 16:51:38,210 DEBUG: http://10.C.C.170:2379  "GET /v2/machines HTTP/1.1" 404 19
2019-12-26 16:51:38,211 ERROR: Failed to get list of machines from http://10.C.C.170:2379/v2 : EtcdException('Bad response : 404 page not found\n',)
2019-12-26 16:51:38,211 INFO: Retrying on http://10.A.A.191:2379 
2019-12-26 16:51:38,211 DEBUG: Converted retries value: 0 -> Retry(total=0, connect=None, read=None, redirect=0, status=None)
2019-12-26 16:51:38,211 DEBUG: Starting new HTTP connection (1): 10.237.132.191:2379
2019-12-26 16:51:38,214 DEBUG: http://10.A.A.191:2379  "GET /v2/machines HTTP/1.1" 404 19
2019-12-26 16:51:38,214 ERROR: Failed to get list of machines from http://10.A.A.191:2379/v2 : EtcdException('Bad response : 404 page not found\n',)
2019-12-26 16:51:38,214 INFO: Retrying on http://10.B.B.99:2379 
2019-12-26 16:51:38,215 DEBUG: Converted retries value: 0 -> Retry(total=0, connect=None, read=None, redirect=0, status=None)
2019-12-26 16:51:38,215 DEBUG: Starting new HTTP connection (1): 10.B.B.99:2379
2019-12-26 16:51:38,217 DEBUG: http://10.B.B.99:2379  "GET /v2/machines HTTP/1.1" 404 19
2019-12-26 16:51:38,217 ERROR: Failed to get list of machines from http://10.B.B.99:2379/v2 : EtcdException('Bad response : 404 page not found\n',)
2019-12-26 16:51:38,217 INFO: waiting on etcd

The problem seems to be at API level DEBUG: http://10.B.B.99:2379 "GET /v2/machines HTTP/1.1" 404 19 etcd is reacheable from PostgreSQL host: curl -s http://10.B.B.99:2380/members |jq -r returns

[
  {
    "id": 730XXXXXXXXXXX000,
    "peerURLs": [
      "http://10.B.B.99:2380 "
    ],
    "name": "etcd1",
    "clientURLs": [
      "http://0.0.0.0:2379 "
    ]
  },
  {
    "id": 956XXXXXXXXXXX000,
    "peerURLs": [
      "http://10.C.C.170:2380 "
    ],
    "name": "etcd3",
    "clientURLs": [
      "http://0.0.0.0:2379 "
    ]
  },
  {
    "id": 1551XXXXXXXXXXX000,
    "peerURLs": [
      "http://10.A.A.191:2380 "
    ],
    "name": "etcd2",
    "clientURLs": [
      "http://0.0.0.0:2379 "
    ]
  }
]

***etcd1 start command:***

ExecStart=/usr/local/bin/etcd \
--name etcd1 \
--advertise-client-urls http://0.0.0.0:2379  \
--listen-client-urls http://0.0.0.0:2379  \
--initial-advertise-peer-urls http://10.B.B.99:2380  \
--listen-peer-urls http://0.0.0.0:2380  \
--initial-cluster etcd1=http://10.B.B.99:2380,etcd2=http://10.A.A.191:2380,etcd3=http://10.C.C.170:2380  \
--initial-cluster-token etcd-cluster-atom \
--initial-cluster-state new \
--logger zap \
--log-outputs stdout \
--log-level debug

Someone could help me please? What is wrong? Many thanks **Versions:** etcd Version: _3.4.0_ etcdctl version: _3.4.0_ API version: _3.4_ patroni _1.6.3_ python-etcd==_0.4.5_