Confirmation and reminder emails sent by/from default domain

[Deleted]

Bookings notifications are being sent by our old default domain (yourefolio.onmicrosoft.com). We want them sent from yourefolio.com and this domain is active/verified. I just can't figure out why the emails from the Bookings app are sending from the old one or how to fix it. Any thoughts?

Thanks, 
Tracey

[#2]

@Deleted You can change the primary SMTP address of the Bookings mailbox by running the following command:

Set-Mailbox <current_bookings_address> -WindowsEmailAddress <desired_bookings_address>

Keep in mind that the confirmations and reminders won't switch immediately to the new address.

[#3]

I did a write-up on how Bookings sends emails and how to adjust the sender address here: https://blog.markdepalma.com/?p=681