They’ve published a warning about reselling tickets.
It says anyone caught doing that can be kicked out of the fan club.
Also states that taking a screenshot of the ticket will not work for entry.
https://avex.jp/ayu/news/detail.php?id=1078890
I can confirm that there is some kind of technology that prevents entry with screenshots of QR codes. A few years ago going to a Namie Amuro concert, my phone was having problems. I was scared I’d lose the QR code because they only allow 1 download of it. So I took a screenshot and emailed it to myself. Well, on the day of the concert my entry was blocked and I had to go on a special line and explain what happened.
For this reason I would not recommend people to buy QR tickets from resellers! Wait until there is an official ticket trading system from avex. I’m positive they will introduce this later on.