I have purchased a roku device from amazon but it is not being connected with the app. here details I've added to all the issues that I've found there.
The Roku Remote Control app will not work unless your Roku is connected to WiFi. Use the remote that came with your Roku to complete the setup
Thanks for posting in the Roku Community.
We suggest checking that your mobile device and your Roku device are on the same wireless network. If you are unable to get your Roku device to connect to the same network, learn what to try when resolving connectivity issues.
We also recommend taking a look at our Support page for more information regarding How to connect the Roku® mobile app to your Roku device over Wi-Fi® | Official Roku Support
Please try doing this and see if it helps with what you're experiencing.Best regards,Mary