diff --git a/cinder/volume/volume_utils.py b/cinder/volume/volume_utils.py
index 831b137b9a1..174f00be560 100644
--- a/cinder/volume/volume_utils.py
+++ b/cinder/volume/volume_utils.py
@@ -996,6 +996,7 @@ def delete_encryption_key(context: context.RequestContext,
                  "cinder's service context.", encryption_key_id)
         conf = CONF
         ks_loading.register_auth_conf_options(conf, 'keystone_authtoken')
+        ks_loading.load_auth_from_conf_options(conf, 'keystone_authtoken')
         service_context = keystone_password.KeystonePassword(
             password=conf.keystone_authtoken.password,
             auth_url=conf.keystone_authtoken.auth_url,
diff --git a/releasenotes/notes/bug-1946483-cryptic-error-in-backup-fe03939577867e0a.yaml b/releasenotes/notes/bug-1946483-cryptic-error-in-backup-fe03939577867e0a.yaml
new file mode 100644
index 00000000000..53173c00399
--- /dev/null
+++ b/releasenotes/notes/bug-1946483-cryptic-error-in-backup-fe03939577867e0a.yaml
@@ -0,0 +1,9 @@
+---
+fixes:
+  - |
+    `Bug #1946483 <https://bugs.launchpad.net/cinder/+bug/1946483>`_: Fixed
+    an issue where admin user fails to delete backup of an encrypted
+    volume with an ``oslo_config.cfg.NoSuchOptError`` error in logs
+    of cinder-backup service.
+    With this fix cloud admin is able to delete backups of encrypted volumes
+    created by other users if Barbican API policies allow it.