ceph-mon : waiting for the monitor fails for jetson nano cluster (arm)

I'm currently trying to setup a very basic Ceph cluster on 5 Jetson Nano Boards with one MON and 4 OSD nodes. The vars I have set are:

devices:
  - /dev/sda

ceph_origin: repository
ceph_repository: community
ceph_stable_release: nautilus
monitor_interface: eth0
public_network: 172.16.0.0/22
dashboard_admin_password: secret
grafana_admin_password: secret

First I did not add a grafana-server group in my inventory which lead to some checks failing so I added the same node from my MON group to the grafana-server group. (Which gives me a ansible warning because of the dash in the groupname)

The error message I get with -vvvv option is:

TASK [ceph-mon : waiting for the monitor(s) to form the quorum...] **************************************************************************************************************************
task path: /home/agoertz/ceph-ansible/roles/ceph-mon/tasks/ceph_keys.yml:2
Friday 06 March 2020  14:41:55 +0000 (0:00:00.777)       0:08:08.394 ********** 
Using module file /usr/lib/python3.8/site-packages/ansible/modules/commands/command.py
Pipelining is enabled.
<cluster-master00> ESTABLISH SSH CONNECTION FOR USER: None
<cluster-master00> SSH: EXEC ssh -vvv -o ControlMaster=auto -o ControlPersist=600s -o StrictHostKeyChecking=no -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o ConnectTimeout=60 -o ControlPath=/home/agoertz/.ansible/cp/%h-%r-%p cluster-master00 '/bin/sh -c '"'"'sudo -H -S  -p "[sudo via ansible, key=jrfpegxxmkfaivcvfvknzycfpqdexrid] password:" -u root /bin/sh -c '"'"'"'"'"'"'"'"'echo BECOME-SUCCESS-jrfpegxxmkfaivcvfvknzycfpqdexrid ; /usr/bin/python'"'"'"'"'"'"'"'"' && sleep 0'"'"''                                                                                                                                                                               
Escalation succeeded
<cluster-master00> (1, b'\n{"changed": true, "end": "2020-03-06 15:41:56.108613", "stdout": "server name not found: [v2:172.16.0.30:3300 (Name or service not known)", "cmd": ["ceph", "--cluster", "ceph", "-n", "mon.", "-k", "/var/lib/ceph/mon/ceph-cluster-master00/keyring", "mon_status", "--format", "json"], "failed": true, "delta": "0:00:00.257905", "stderr": "unable to parse addrs in \'[v2:172.16.0.30:3300,v1:172.16.0.30:6789]\'\\n[errno 22] error connecting to the cluster", "rc": 1, "invocation": {"module_args": {"creates": null, "executable": null, "_uses_shell": false, "strip_empty_ends": true, "_raw_params": " ceph --cluster ceph -n mon. -k /var/lib/ceph/mon/ceph-cluster-master00/keyring mon_status --format json\\n", "removes": null, "argv": null, "warn": true, "chdir": null, "stdin_add_newline": true, "stdin": null}}, "start": "2020-03-06 15:41:55.850708", "msg": "non-zero return code"}\n', b'OpenSSH_8.2p1, OpenSSL 1.1.1d  10 Sep 2019\r\ndebug1: Reading configuration data /etc/ssh/ssh_config\r\ndebug1: auto-mux: Trying existing master\r\ndebug2: fd 3 setting O_NONBLOCK\r\ndebug2: mux_client_hello_exchange: master version 4\r\ndebug3: mux_client_forwards: request forwardings: 0 local, 0 remote\r\ndebug3: mux_client_request_session: entering\r\ndebug3: mux_client_request_alive: entering\r\ndebug3: mux_client_request_alive: done pid = 10194\r\ndebug3: mux_client_request_session: session request sent\r\ndebug3: mux_client_read_packet: read header failed: Broken pipe\r\ndebug2: Received exit status from master 1\r\n')                                                                                                                                                            
<cluster-master00> Failed to connect to the host via ssh: OpenSSH_8.2p1, OpenSSL 1.1.1d  10 Sep 2019
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: auto-mux: Trying existing master
debug2: fd 3 setting O_NONBLOCK
debug2: mux_client_hello_exchange: master version 4
debug3: mux_client_forwards: request forwardings: 0 local, 0 remote
debug3: mux_client_request_session: entering
debug3: mux_client_request_alive: entering
debug3: mux_client_request_alive: done pid = 10194
debug3: mux_client_request_session: session request sent
debug3: mux_client_read_packet: read header failed: Broken pipe
debug2: Received exit status from master 1
fatal: [cluster-master00]: FAILED! => 
  msg: |-
    The conditional check '(ceph_health_raw.stdout | length > 0) and (ceph_health_raw.stdout | default('{}') | from_json)['state'] in ['leader', 'peon']
    ' failed. The error was: Expecting value: line 1 column 1 (char 0)

For reference I also posted this as a comment in: https://github.com/ceph/ceph-ansible/issues/5090

Environment:

OS (e.g. from /etc/os-release): Ubuntu 18.04 (Linux4Tegra derivate) on the Jetsons and Arch Arm on an RPi2 as ansible delploy server.
Kernel: something 5.5.x'ish on the Pi and 4.9 on the Jetsons
Ansible version: 2.9.5
ceph-ansible version: stable-4.0

I only have access to the cluster during the week, so if you need some more information that requires running commands on the cluster I will provide it on Monday.

ceph / ceph-ansible

ceph-mon : waiting for the monitor fails for jetson nano cluster (arm) #5129