Honest feedback. Say when it isn't good enough. Point it out. I've never tried this, but as an idea: can you redirect their questions to a full team chat and g

Honest feedback. Say when it isn't good enough. Point it out. I've never tried this, but as an idea: can you redirect their questions to a full team chat and get their own team members to solve them? Saying "ABC asked XYZ" might put the onus on them to up-skill their team and it might also show you who's able to answer their questions on their side. After a while they might just ask their questions directly in that.