USING A VPN ON A MEXICAN CELL PHONE

TicketMaster will not let me download tickets to my cell for Las Vegas concerts next week. Either msg that my phone is not eligible, etc etc etc. I unistalled to reinstall
the app but it won't reinstall.... I last used my TM app for a concert in the UK in 2018 but I Know that I had the same phone, same app as now for that concert.
I really would rather download tickets before I leave for the states.... I'm assuming that the app should download there.... but can i not use a VPN and which is best - free.
Entry is only by QR CODE.... masks, vaccine cert or neg. test. But it's music!