[SSSD-users] offline auth and system upgrades

I've been using sssd + AD to do auth for a few years now. Offline authentication is
enabled and works normally. In that time I've upgraded my Ubuntu laptop several times,
and each time I noticed that after the update, I cannot log in unless I'm on the corp
network with direct access to AD. That hasn't really been a problem until now. I'm
working from home over vpn all the time and don't have to option of going in to get on
the corp network.

I know the workaround is to use a local account, get on the VPN, authenticate with my AD
account and populate the cache, but IT doesn't like me creating local users and
it's a pain. I haven't tried the latest update yet (19.10 -> 20.04, sssd
currently 2.2.0).

Since something in the upgrade process is presumably destroying the cache, I was wondering
if there's a "nice" way around this? Ubuntu upgrades for sssd seem like
they're just upgrading sssd via apt, so I'm wondering why these major updates seem
to operate differently from minor ones, and if that's intentional.

Thanks!