Thanks for posting in the Seller Community.
We don't have a way for order notification emails to go to multiple mail addresses. Right now, they will only be sent to the account owner email address:
This is a great feature request though, and one we've encountered in the past. I'll make sure to pass the resurfacing of this suggestion along to our Product Team.
We have our Square account under one main email. However, we would like to link a second email for one of the other managers to also receive notifications when a customer places an order in the online store. Is this possible? And if so, how?