Help with changing the email address on Acuity scheduling

Hi there everyone - I manage a website for a client who uses Acuity scheduling via her SquareSpace website. We set it up using her old email. She's since changed the email address and we've updated the email linked to the calendar and email notifications to clients are going to / from the new one. 

However, she's still receiving direct notifications from Acuity to the old email, see below.

Where do I change this on SquareSpace - can't find it anywhere!

Thanks in advance, Kate

From: Acuity Scheduling <no-reply@acuityscheduling.com>
Date: On Wednesday, October 11th, 2023 at 16:16
Subject: 3 Appointments for Thursday, October 12, 2023
To: OLD EMAIL ADDRESS>

Thursday, October 12, 2023   4:00pm     Eliza Bayley Child follow-up consultation — AH   view » Paid, card on file