Fixed Ceph Dashboard not accessible
Check which node the Dashboard is currently in.

[root@ceph02 ~]# ceph mgr services
{
    "dashboard": "https://ceph02:8443/"
}

Restart Dashboard in Ceph02 (restart on that node and restart on that node)

[root@ceph02 ~]# ceph mgr module  disable  dashboard
[root@ceph02 ~]# ceph mgr module  enable  dashboard

At this point the browser accesses
again