My experience so far…
I entered my mobile number on the website to get a text with the app. Nothing came through (and still hasn’t) so had to find it manually in the app store.
In the app: On the signup flow I’m on the ‘My Details’ screen but when I click next it flashes up the next screen and then reverts me to the previous one.
I click ‘skip’ to get to the ‘Referral and promo’ screen and that too won’t let me proceed unless I enter a value - which I don’t have 
So far there has been an issue at each step, so I’ve therefore got frustrated and given up 