Is this a new test? Was there a bz to add ipv6 support? We do not support ipv6 still.
https://github.com/ceph/ceph-ansible/releases/tag/v3.2.0rc2
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2019:0020