Looks like I got lucky, I ran into this where a while after moving a switched to a new phone and couldn't activate line because I didn't have the old number any

Looks like I got lucky, I ran into this where a while after moving a switched to a new phone and couldn't activate line because I didn't have the old number anymore. However I managed to sort it out with the line customer service (even though some of the questions like "when did you first register your line account" I could only guestimate because it was so long ago).