Many companies don't allow details, but are allowed to confirm a person was employed in a specific role. That's in many cases a sufficient to serve as a reference.
E.g. In my company we have a very strict policy for this, but are still allowed to answer "yes, Bob was employed as problem manager team lead from 2023 to 2025". Conversely as a hiring manager, I'll take that as a minimally sufficient data point in confirming resume entry.
Many companies don't allow details, but are allowed to confirm a person was employed in a specific role. That's in many cases a sufficient to serve as a reference.
E.g. In my company we have a very strict policy for this, but are still allowed to answer "yes, Bob was employed as problem manager team lead from 2023 to 2025". Conversely as a hiring manager, I'll take that as a minimally sufficient data point in confirming resume entry.