Florian already worked on a fix for that issue and has been merged in master and I've proposed the backport into stable/queens.
According to our records, this should be resolved by openstack-tripleo-validations-8.4.1-5.el7ost. This build is available now.
Still failing with the same error in: openstack-tripleo-validations-8.4.1-5.el7ost.noarch Task 'Fetch available images' failed: Host: localhost Message: Command `openstack image list --format value --column Name` exited with code: 1: non-zero return code stderr: (https://192.168.24.2:13000/v2.0/tokens): The resource could not be found. (HTTP 404) (Request-ID: req-1f25a016-8ded-43b6-90a2-eaad51b086ab) Failure! The validation failed for all hosts: * localhost
Verified: openstack-tripleo-ui-8.3.2-2.el7ost.noarch
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-2018:3587
The needinfo request[s] on this closed bug have been removed as they have been unresolved for 1000 days