We're sorry to hear about the issue you're experiencing.
Please be advised that Bulgaria is not an officially supported region for Roku, so you cannot add Disney Plus and Prime Video.
Any Roku Player or TV can be activated to any Roku account, however, channel availability/access will vary from region to region. Channels that are currently available in any given region are certified for the Roku devices sold in that region.
For more information, you'd want to contact any specific channel/service provider to inquire further about which Roku devices they support their channel (app) on in your current region.
We appreciate your understanding.
All the best,
Roku Forum Moderator