Apple sandbox tester "this field is invalid" for password

The password should start with a letter and include capitals, smalls, and numbers, like "Heyheyheyho21”.

But I find the interface in this form really bad. You need to fill in every field correctly, in order, or the form just freezes up.

So first name, then tab to last name, then tab to email (does not have to be real), then password and confirm password, then secret question (I use "testing") and answer (I use "testingtesting"), then date and store country.

You will then be able to click Invite and move on.