Hi Vanessa - I am not using the Gmail add-on. I am using the x+12345678@mail.asana.com format to send/assign tasks to a specific person. There is no error notification received and I have contacted Gmail. They say that all emails went out/sent. So I am confused.
I also used the same method to send tasks via a different email address/account and it worked. So this is just for this particular account under admin@mycompany.com that I am unable to send tasks via email.