Yea, I think the wording in the title seems fine.

I probably end up slightly wordier...

"Hmm, not sure. My best guess is that we're probably pulling some values from context and then using that to determine the behavior you're seeing, but I know my manager has a few contacts on that side of the org, I'll reach out to her and get back to you, probably in the next few days"

And then yea, just... delivering on what you say you're gonna do or updating if there's some bends in the road you didn't see.