I entered travelers and published the trip, but the "Send" button to send the email with the app login is disabled

I entered travelers and published the trip, but the "Send" button to send the email with the app login is disabled

The "Submit" button is disabled as shown below:


This occurs when there is no email registered with the user of the traveler(s), according to the print:



It is necessary to enter email for all travelers, so you will normally enable the button to send the email with the app login.
(Note: the email needs to be a ONE email for each traveler).