For a paid product, it's really not that hard to already have a fairly solid idea of what's going on - this just ensures that a responsible adult has gone through a clear process of signing off on the identity for this specific service, rather than a kid with their parent's credit card.
I see you have an uncommon name.
My first+last are shared by about 20,000 people in the US. From 2005-2020 I was unable to check-in for airlines online or even at the kiosk at the airport. I had to wait on line for baggage check-in despite never checking a bag, and they'd take my ID into the back room and delay me for 15 minutes and whisper and glare at me the whole time. Thankfully I can finally fly like a normal person again.
When I worked at a large company, there were four other people with the same first name, middle initial, and last name.
There is nothing surprising or rare about two customers having the same name.
But the sequel: a few years later I get a bill from a hospital for copay for delivery/childbirth. I call to contest ... we did not even live there any more, did at some point of time but years apart ... but they are adamant that my wife gave birth, at that hospital, on that date, in that city, and maybe she never informed me :) it was almost that weird. I don't act on it and give them a statement that it is not me/my family. Then another bill (or a final notice) a couple of years later. And then finally something clicks ... I used to work in a team where when I moved out, someone replaced me and his name was also same as me. Reach out to him, and his wife's name is same as mine, and they lived in the same city we lived in.
So someone somewhere fat fingered the wrong account when searching by name. He acknowledged the account (and childbirth) and paid up. I unfortunately did not ask him about his wife's date of birth to solve the immigration mystery.
My suspicion has been at my past employer's HR or legal department mixing up files
