Forwarder/Alias for top level domain zone 'group'

I am trying to make a forwarder for the email address info@domain.group
So if I am writing in the 'Forward to' field anything with TLD *.group I am getting an error:
All entered emails must be valid
So, how to fix that?..

The problem solved.
My mistake.
I have put space after a comma, that was the source of the validation error.