The volume can't be attached because iSCSI authentication fails. Either it's not set up correctly in cinder.conf on the controller, or you hit a bug. When you google for /iscsi authentication /and /Cinder /or /Nova/, you get plenty of hits, such as https://ask.openstack.org/en/question/92482/unable-to-attach-cinder-volume-iscsi-require-authentication/.
This is the command that fails on the controller. The IP address or target might be incorrect, or the credentials, which are set by earlier iscsiadm commands.
iscsiadm -m node -T iqn.2010-10.org.openstack:volume-9ae59d83-ec09-4fd5-aa2c-5049a29bed5e -p 172.23.29.118:3260 --login
Bernd
smime.p7s
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