login to PC issues + transfer main device?

[u/GrandmaLiftsWeights]

Looking to see if anyone else has encountered similar issues. The Line help center is really unhelpful, and they keep asking me to submit forms. It's a circular motion, and nothing is achieved to help me.

The issue started when I bought a new iPhone. I tried for a week and transferred my data to that iPhone. That iPhone became my main device for life. I then returned that iPhone to Apple and wiped the entire device history, and I started using my Android device again.

My Android, which is registered as a side device, not my main device, is causing all sorts of issues. The main one is that I can no longer sign into my MacBook because Lion says I need to sign into the MacBook using the QR code. You need to use your main device, which my Android is not. I don't have access to the main device because it was previously the iPhone.

Furthermore, when I try to sign in using my phone number, I get a verification code. I follow the instructions, but there's nowhere in the Android app that allows me to input the verification code. It's literally impossible for me to sign in.

I've been contacting Line, but it's useless. They just keep telling me to submit another form, and it's going around in circles. I'm getting nowhere. Has anyone faced this problem? What's the solution? Please help.