As far as I can tell, the actual issue is that Vault doesn't actually support jammy according to the metadata that I can find:
$ juju download vault --series jammy
ERROR "vault" does not support series "jammy" in channel "stable". Supported series are: bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, xenial.
$ juju deploy vault --series jammy
ERROR series "jammy" not supported by charm, supported series are: focal, bionic, xenial, impish, hirsute, groovy, eoan, disco, cosmic. Use --force to deploy the charm anyway.
While it is also a bug that we don't give a better error message, the issue is that we cannot deploy a jammy vault because it doesn't exist.
As far as I can tell, the actual issue is that Vault doesn't actually support jammy according to the metadata that I can find:
$ juju download vault --series jammy
ERROR "vault" does not support series "jammy" in channel "stable". Supported series are: bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, xenial.
$ juju deploy vault --series jammy
ERROR series "jammy" not supported by charm, supported series are: focal, bionic, xenial, impish, hirsute, groovy, eoan, disco, cosmic. Use --force to deploy the charm anyway.
While it is also a bug that we don't give a better error message, the issue is that we cannot deploy a jammy vault because it doesn't exist.