If it's any help this is the email I got when I asked them if it was at the national stadium
Hi,
It’s in Stade Josy Barthel in Luxemburg City
If you want tickets in the Rangers section please send an email to *******@rangers.co.uk
If you want to support our Black and Yellow, tickets will go on sale from Friday afternoon at the Jos Haupert stadium in Niederkorn and at the Brasserie Lo Stadio in Niederkorn at opening times.
Otherwise they will be on sale at the evening cashier at the Josy Barthel Stadium.
If you can not move before the match, we ask you to pay the amount corresponding to the number of tickets (20 € the ticket) on the Progress account:
BIC Code: CCRALULL
IBAN: LU91 0090 0000 6390 4098
And to provide proof of payment so that your places are to be removed at the checkout Invitations
Greetings
Sophie Raoul
sophie.progres@pt.lu
I've removed the Rangers contact as it's someones name