Hello,
for our trip in April/May I tried to book the bus Talinn - Riga and Riga - Vilnius (since trains are not the most efficient way of travelling). On the partner deal page of Interrail it said a discount of 20% is applicable + a code is given. When this code didn’t give the result, I emailed to Lux.
I got this answer:
Hello!
I would like to inform you that our company does not cooperate with Interrail, so unfortunately this discount is not available.
Best regards,
Marta
Lux Express
Good to know for everyone.