The most likely reason is that your Roku account is associated with the wrong region. There's no way to fix it other than creating a new Roku account, factory resetting your Roku device, and linking to the new account. If you have any subscriptions through Roku (which you can see at https://my.roku.com ), you'll want to cancel them. If you don't have a different email address to use for the new account, close the old account before creating a new account. You should probably close the old account anyway. When you create the new account at https://my.roku.com/signup , you should use a different browser, a different computer, or a private or incognito browser winder to ensure the same wrong region association doesn't happen again.
Another possibility is that you are connecting to the internet through a VPN service that masks your actual location - either now, or when you first set up your account.
You can use an IP info website like the ones listed below to see where the IP indicates you are located.
Some IP info websites:
https://www.iplocation.net/
https://www.iplocation.com/
https://tools.keycdn.com/geo
https://www.ipfingerprints.com/
A web search for "IP Location" can find many more.
