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.
In addition, it sounds like you may have created a Roku account that isn't located in your current region. If channels in your region are not available, it may indicate that your device is linked to an account that was created in a different region where that channel may not be offered by the channel provider. You'll want to make sure that you are using an internet connection located in the correct region when creating your account. You can check your IP address' reported location by visiting www.whatismyip.com - If you see an issue, you'll need to contact your ISP to help resolve any issue.
We would recommend creating a new Roku account in your region. For more information about how to create a new account, visit our Support page here: How do I create a Roku® account? Once your new account is set up, try to perform a factory reset on your device and link it to your new account. For more information about how to perform a factory reset, visit our Support page here: How do I factory reset my Roku® streaming device?