Hello @lilo
Thanks for reaching out here in the Community!
Channel availability/access on Roku devices will vary from region to region. A Roku device will work in any location, however, channels may not be available on your device in that location, based on each channel provider's discretion.
For more information, you'd want to contact HBO directly to inquire further about whether they offer their channel/service on the Roku platform in your region.
Regards,
Karla