Bug: ubuntu-advantage charm successfully enables pro esm repos, but returns exit code 2

[ethanmye-rs]

Description of the bug

After attaching a token (with juju config ubuntu-advantage token=<token>), the attach fails with exit code 2. Looking at the machine itself, the pro attach seems to have worked (i.e, esm is enabled and running apt update shows the repos)

Expected behavior

If this is a partial attach (i.e a service failed on enablement) as suggested, it would be nice to know which one failed, and why, preferably at the charm level.

Current behavior

Machine fails with exit code 2, but there's no docs describing what exit code 2 actually is. The system then kicks off a retry loop, but it finds the system is already registered, see attached logs and chat.

To Reproduce

I do not have a reproducer readily available. However, if it is a failure to attach resources, then selectively blocking a resource (i.e esm, usg, livepatch, w/e) with a proxy or bad hosts entry should trigger the same issue.

System information:

• Ubuntu release: "22.04.5 LTS (Jammy Jellyfish)"
• Pro Client version: 34~22.04

Additional context

See logs upload here, not sure if they have sensitive info, so I've marked it Canonical only in drive: https://drive.google.com/file/d/1yp-tJX5HEN3Fr4n7eEeaihedoixnKOZ3/view?usp=sharing