PLEASE NOTE: Roku can only release the Disney+ channel app (or any other channel app for that matter) in regions where the channel owner has authorized Roku to release the app. This authorization may lag behind release of this channel for web streaming in that region. I can find no reference listing which countries have Disney+ apps for Roku.
Roku Community Streaming Expert I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well. If this post solves your problem please help others find this answer by clicking "Accept as Solution.".
Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X
We do not have a dedicated Roku presence in Poland at this time, so it is very likely the channel is not currently available on the Roku platform. 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 any specific channel/service provider to inquire further about whether they offer their channel/service on the Roku platform in your region.
We thank you for your patience and we hope to expand our presence soon.