OCS/ODF HEALTH_ERR 1 filesystem is degraded, 1 filesystem is offline , 1 mds daemon damaged - Monitors have assigned me to become a standby

Issue

OCP applications cannot access (read or write) any PV based on cephfs

Ceph status shows no active mds daemon:

$ more ceph_status 
  cluster:
    id:     xxxxe547-xxxx-4b75-976b-xxxxxxxxx
    health: HEALTH_ERR
            1 filesystem is degraded
            1 filesystem is offline
            1 mds daemon damaged

  services:
    mon: 3 daemons, quorum e,m,o (age 65m)
    mgr: a(active, since 83m)
    mds: 0/1 daemons up, 2 standby  <<-----
    osd: 6 osds: 6 up (since 63m), 6 in (since 2d)

  data:
    volumes: 0/1 healthy, 1 recovering; 1 damaged
    pools:   11 pools, 369 pgs
    objects: 27.75k objects, 18 GiB
    usage:   52 GiB used, 24 TiB / 24 TiB avail
    pgs:     369 active+clean


$ ceph health detail 
HEALTH_ERR 1 filesystem is degraded; 1 filesystem is offline; 1 mds daemon damaged
[WRN] FS_DEGRADED: 1 filesystem is degraded
    fs ocs-storagecluster-cephfilesystem is degraded
[ERR] MDS_ALL_DOWN: 1 filesystem is offline
    fs ocs-storagecluster-cephfilesystem is offline because no MDS is active for it.
[ERR] MDS_DAMAGE: 1 mds daemon damaged
    fs ocs-storagecluster-cephfilesystem mds.0 is damaged

$ ceph mds stat 
ocs-storagecluster-cephfilesystem:0/1 2 up:standby, 1 damaged

# ceph fs dump

[mds.ocs-storagecluster-cephfilesystem-b{-1:70220731} state up:standby seq 1 addr [v2:10.131.56.12:6800/1431004327,v1:10.131.56.12:6801/1431004327]]
[mds.ocs-storagecluster-cephfilesystem-a{-1:70254582} state up:standby seq 2 addr [v2:10.131.54.12:6800/1914593486,v1:10.131.54.12:6801/1914593486]]

All OCS relevant pods up and running, even the mds pods:

rook-ceph-mds-ocs-storagecluster-cephfilesystem-a-7f9d485fcpwbf  2/2    Running  0         1h25m  
rook-ceph-mds-ocs-storagecluster-cephfilesystem-b-589b69b4x6q6c  2/2    Running  0         1h8m