Comment 1 for bug 1979333

I'm not sure if this is related, but the 1.7/edge charm for vault doesn't support xenial, which is specified in the bundle. Juju info for series xenial only shows 1.5 and 1.6 supports:

$ juju info vault --series xenial
name: vault
charm-id: u3vtXfBTJwhYCwwvkzCs0YqdCfsOBMdO
summary: a tool for managing secrets
publisher: OpenStack Charmers
supports: xenial, bionic, focal, groovy, hirsute, impish
tags: security
subordinate: false
store-url: https://charmhub.io/vault
description: |
  Vault secures, stores, and tightly controls access to
  tokens, passwords, certificates, API keys, and other
  secrets in modern computing. Vault handles leasing, key
  revocation, key rolling, and auditing. Through a unified
  API, users can access an encrypted Key/Value store and
  network encryption-as-a-service, or generate AWS IAM/STS
  credentials, SQL/NoSQL databases, X.509 certificates,
  SSH credentials, and more.
relations:
  provides:
    certificates: tls-certificates
    nrpe-external-master: nrpe-external-master
    secrets: vault-kv
  requires:
    db: pgsql
    etcd: etcd
    ha: hacluster
    lb-provider: loadbalancer
    shared-db: mysql-shared
channels: |
  latest/stable: 54 2022-02-09 (54) 44MB
  latest/candidate: ↑
  latest/beta: ↑
  latest/edge: ↑
  1.7/stable: –
  1.7/candidate: –
  1.7/beta: –
  1.7/edge: –
  1.6/stable: –
  1.6/candidate: –
  1.6/beta: –
  1.6/edge: 54 2022-03-04 (54) 44MB
  1.5/stable: –
  1.5/candidate: –
  1.5/beta: –
  1.5/edge: 54 2022-03-04 (54) 44MB

I suspect that revision 54 got deployed? Really, the bundle should have failed as there is no 1.7/edge vault charm for xenial. 1.7 on vault only supports focal and jammy.