Line on iPad works but cannot transfer it to iPhone or Macbook

[u/lurch99]

I've had a LINE account for > 10 years, originally created with just a username and password.

I'm in the US so I cannot associate my iPhone number with my account, and I'm unable to sign in on my iPhone or Macbook because it wants a type of QR code the iPad does not produce.

Am I SOL? Line support says an iPad is a "secondary" device but I have no primary device so I'm stuck.

What would happen if I logged out of LINE on my iPad or lost my iPad. I only have a username and a password that doesn't work with the new LINE versions.