Phrases Phrases for Phone and Online Communication

I'm not sure I understand.

Meaning

I'm having difficulty comprehending.

Translation language

John: The new regulations require a complete overhaul of our compliance procedures.
Alice: <b>I'm not sure I understand</b>. Could you elaborate?
John: Essentially, we need to completely revamp our safety protocols.
Alice: Oh, I see. Thanks for clarifying. <b>I'm not sure I understand</b> the full implications yet though.