The webform can't be completed becaus erequired Date of Birth can only be input by selecting from a calendar widget which requires paging back 12 times per every year ylu've been alive. This is one more cynical bad faith ruse from advertisers.
You can go back by the year. Though I ended up hitting another roadblock down the road yesterday. So, I am currently waiting a couple of weeks for the flow to be functional.
FWIW not true on safari on iOS, direct month entry works fine
There’s a tiny blue arrow in the widget that lets you scroll to a year (iOS Firefox)