Hi, I have now sent an email to support. This all seems very buggy - does not inspire confidence.

Hi, it’s still not working. I have also now purchased a subscription via Apple App Store which I cannot redeem, not even via desktop as I have not been sent the id

App login not working for me either. Windy (not Windy maps) on 2019 iPad 9.7” running iPadOS 13.6