I went through the validation process for focal-victoria UCA successfully, here it's the evidence:

$ juju ssh magnum/0 "apt policy python3-magnum"
python3-magnum:
  Installed: 11.2.1-0ubuntu1~cloud0
  Candidate: 11.2.1-0ubuntu1~cloud0
  Version table:
 *** 11.2.1-0ubuntu1~cloud0 500
        500 http://ubuntu-cloud.archive.canonical.com/ubuntu focal-proposed/victoria/main amd64 Packages
        100 /var/lib/dpkg/status
     11.0.0+git2021031515.d60e7049-0ubuntu1~cloud0 500
        500 http://ppa.launchpad.net/openstack-charmers/magnum-victoria/ubuntu focal/main amd64 Packages
     10.0.0-0ubuntu0.20.04.2 500
        500 http://nova.clouds.archive.ubuntu.com/ubuntu focal-updates/universe amd64 Packages
     10.0.0~b3~git2020041013.01629398-0ubuntu1 500
        500 http://nova.clouds.archive.ubuntu.com/ubuntu focal/universe amd64 Packages
Connection to 10.5.2.168 closed.
$ juju ssh magnum-dashboard/0 "apt policy python3-magnum-ui"
python3-magnum-ui:
  Installed: 7.0.1-0ubuntu1~cloud0
  Candidate: 7.0.1-0ubuntu1~cloud0
  Version table:
 *** 7.0.1-0ubuntu1~cloud0 500
        500 http://ubuntu-cloud.archive.canonical.com/ubuntu focal-proposed/victoria/main amd64 Packages
        100 /var/lib/dpkg/status
     5.2.0-1 500
        500 http://nova.clouds.archive.ubuntu.com/ubuntu focal/universe amd64 Packages
Connection to 10.5.0.22 closed.
$ tox -e func-target -- keystone_v3_smoke_focal_magnum:focal-victoria-magnum 2>&1 | tee focal-victoria-magnum.log
func-target: commands[0] /mnt/git/charmed-openstack-tester/tests/distro-regression> functest-run-suite --keep-model --bundle keystone_v3_smoke_focal_magnum:focal-victoria-magnum
2023-05-22 15:52:32 [INFO] Deploying bundle '/mnt/git/charmed-openstack-tester/tests/distro-regression/tests/bundles/focal-victoria-magnum.yaml' on to 'zaza-0120c86b1610' model
2023-05-22 15:52:33 [INFO] Rendered template '<Template 'local-charm-overlay.yaml.j2'>' to file '/tmp/tmp0wcwfo60/local-charm-overlay.yaml'
2023-05-22 15:52:34 [INFO] Rendered template '<Template 'focal-victoria-magnum.yaml.j2'>' to file '/tmp/tmp0wcwfo60/focal-victoria-magnum.yaml'
2023-05-22 15:52:34 [INFO] Deploying overlay '/tmp/tmp0wcwfo60/local-charm-overlay.yaml' on to 'zaza-0120c86b1610' model
2023-05-22 15:52:34 [INFO] Deploying overlay '/tmp/tmp0wcwfo60/focal-victoria-magnum.yaml' on to 'zaza-0120c86b1610' model
[...]
======
Totals
======
Ran: 120 tests in 2093.9167 sec.
 - Passed: 111
 - Skipped: 9
 - Expected Fail: 0
 - Unexpected Success: 0
 - Failed: 0
Sum of execute time for each test: 1279.3202 sec.

==============
Worker Balance
==============
 - Worker 0 (120 tests) => 0:34:53.916661
2023-05-22 17:12:55 [INFO] Finished testing zaza-0120c86b1610
2023-05-22 17:12:55 [INFO] Events:
  Configure zaza.openstack.charm_tests.glance.setup.add_cirros_alt_image:
    Start: 1684773196.101682
    Finish: 1684773205.078434
    Elapsed Time: 8.976752042770386
    PCT Of Run Time: 1
  Configure zaza.openstack.charm_tests.glance.setup.add_cirros_image:
    Start: 1684773187.5925953
    Finish: 1684773196.1015372
    Elapsed Time: 8.508941888809204
    PCT Of Run Time: 1
  Configure zaza.openstack.charm_tests.glance.setup.add_lts_image:
    Start: 1684772850.5777047
    Finish: 1684772936.6434498
    Elapsed Time: 86.06574511528015
    PCT Of Run Time: 2
  Configure zaza.openstack.charm_tests.glance_simplestreams_sync.setup.sync_images:
    Start: 1684772629.7885244
    Finish: 1684772850.5771177
    Elapsed Time: 220.78859329223633
    PCT Of Run Time: 5
  Configure zaza.openstack.charm_tests.heat.setup.domain_setup:
    Start: 1684773205.0786343
    Finish: 1684773226.410176
    Elapsed Time: 21.331541776657104
    PCT Of Run Time: 1
  Configure zaza.openstack.charm_tests.keystone.setup.add_demo_user:
    Start: 1684773139.814758                                                                                                                                                                               Finish: 1684773180.6832027
    Elapsed Time: 40.8684446811676
    PCT Of Run Time: 1
  Configure zaza.openstack.charm_tests.keystone.setup.add_tempest_roles:
    Start: 1684773180.6835108
    Finish: 1684773187.5924044
    Elapsed Time: 6.908893585205078
    PCT Of Run Time: 1
  Configure zaza.openstack.charm_tests.magnum.setup.add_image:
    Start: 1684773243.4676805
    Finish: 1684773420.6759868
    Elapsed Time: 177.20830631256104
    PCT Of Run Time: 4
  Configure zaza.openstack.charm_tests.magnum.setup.domain_setup:
    Start: 1684773226.4104092
    Finish: 1684773243.4674773
    Elapsed Time: 17.05706810951233
    PCT Of Run Time: 1
  Configure zaza.openstack.charm_tests.neutron.setup.basic_overcloud_network:
    Start: 1684772936.6438763
    Finish: 1684773113.5059807
    Elapsed Time: 176.86210441589355
    PCT Of Run Time: 4
  Configure zaza.openstack.charm_tests.nova.setup.create_flavors:
    Start: 1684773113.5067728
    Finish: 1684773129.2145195
    Elapsed Time: 15.707746744155884
    PCT Of Run Time: 1
  Configure zaza.openstack.charm_tests.nova.setup.manage_ssh_key:
    Start: 1684773129.2150698
    Finish: 1684773139.8145695
    Elapsed Time: 10.599499702453613
    PCT Of Run Time: 1
  Configure zaza.openstack.charm_tests.vault.setup.auto_initialize:
    Start: 1684772258.4469445
    Finish: 1684772629.7883701
    Elapsed Time: 371.34142565727234
    PCT Of Run Time: 8
  Deploy Bundle:
    Start: 1684770752.6831994
    Finish: 1684770933.6840496
    Elapsed Time: 181.00085020065308
    PCT Of Run Time: 4
  Prepare Environment:
    Start: 1684770743.718927
    Finish: 1684770752.6813915
    Elapsed Time: 8.962464570999146
    PCT Of Run Time: 1
  Test zaza.openstack.charm_tests.tempest.tests.TempestTestWithKeystoneV3:
    Start: 1684773420.6787443
    Finish: 1684775575.065153
    Elapsed Time: 2154.3864085674286
    PCT Of Run Time: 45
  Wait for Deployment:
    Start: 1684770933.6841521
    Finish: 1684772258.4408813
    Elapsed Time: 1324.7567291259766
    PCT Of Run Time: 28
Metadata: {}

['tempest', 'run', '--workspace', 'zaza-0120c86b1610', '--config', '/home/ubuntu/.tempest/zaza-0120c86b1610/etc/tempest.conf', '--smoke', '--exclude-regex', '^(octavia_tempest_plugin|manila_tempest_tests|designate_tempest_plugin)\\..*', '--include-list', '/tmp/tmpin4wr_eq/include.cfg', '--exclude-list', '/tmp/tmpin4wr_eq/exclude.cfg']
  func-target: OK (4836.96=setup[0.20]+cmd[4836.76] seconds)
  congratulations :) (4837.40 seconds)