"The data you have entered already exists" when trying to create contac@mydomain.com

"The data you have entered already exists" when trying to create contac@mydomain.com

Hi all,

Our domain is ananasjuicebar.com. Working as admin in the control panel:
When I try to add the email account "contact@ananasjuicebar.com" I get the error: "The data you have entered already exists"

I've tried creating a new user or creating a new group with this address associated.
To my knowledge this address has never been added and I can also not find any reference to it. (Shopify used this address to send customer notifications BEFORE setting up Zohomail.)

Any ideas? are there any restrictions on "Contact"?

thanks!