They can take it as authoritative, but that won't change the consequences if they're wrong. This is already a thing between two people; "my cop friend told me it was okay" isn't a legal defense. Changing the 2nd person to an AI doesn't change much, both are still agents of the government.

Doesn't really have any bearing on a similar system for HR. The government is sort of unique in a bunch of ways, but not really being responsible for what their low level agents say is one of them.

I'm not sure how to fix that, to be honest. I'm also not sure how much worse it is than trying to Google it? Google is full of stuff that's either wrong, or won't apply for a reason that takes some reading comprehension to grasp (e.g. state-specific rules/programs/etc).