Iphone 13. Scanned the QR code on the website, which then came up with an Activate Now screen on the phone which I selected. Then got a message saying I could continue using my phone. 10 mins later got a message saying sim not activated. It has however populated the IMEI2, ICCID, MEID slots under about and also displays the Japanese Number associated with the sim.
Did you download the profile for IIJMio?