Help & troubleshooting for channels on your Roku device, including adding/removing channels, logging in to, authenticating, or activating a channel, channel-specific playback issues, assistance contacting channel publishers to report issues, and adjusting channel-specific settings.
How I fixed the problem with adding channels to my Roku devices
This information applies to Verizon FiOS customers in the United States of America only.
First, you need to log into your Roku account and unlink each Roku device. Second, you need to use your smartphone or tablet running Apple iOS or Google Android and download and install the Verizon My FiOS app. Log into your Verizon account within the app. Click on the Internet button and find the section that says to reboot your router. Make sure to reboot your router before proceeding further.
Second, once your Verizon router reboots and it establishes Internet connectivity, you need to close the Verizon My FiOS app and open it again. Make sure it says that the app is connected to your Verizon router before proceeding further. Click on the Internet button and find the feature called Self Organizing Network (SON). Click that button and flip the switch so it is off. If it is already off, then good. Self Organizing Network combines your 802.11 Wi-Fi devices under the 2.4 GHz Wi-Fi spectrum. Roku devices operate best on the 5 GHz Wi-Fi spectrum.
Third, go back to the Verizon My FiOS app and click the Internet button again. Make sure it is connected to your Verizon router and look at the list of devices that are connected to your router. Find each Roku device and make sure each one is connected to your Verizon router. If necessary, go to your Mac, Windows or GNU/Linux or BSD UNIX PC and open up a web browser and type in http://192.168.1.1
Next, click the proceed button and log into your Verizon router. If you never changed the default admin account, look at the sticker on the side of your Verizon router for the ID and password. The ID should be admin and the password should be on the sticker. Get a piece of paper and write that information down exactly and type in the password correctly to log into your Verizon router. If you changed the ID and password for your Verizon router, open up your password manager and use your own credentials to log into your Verizon router.
Once you logged into your Verizon router, click on the Network button on the top and click the show more button. Look at the list of devices connected to your Verizon router. Take a close look at each Roku device that is connected to your router and make sure each one is connected at 5 GHz Wi-Fi spectrum.
Go to each Roku device one at a time and turn it on. Click Settings -> System -> Power -> Restart. Restart each Roku device one at a time. After each Roku device restarts itself, click on the Network -> Check Connection button. Make sure your Wi-Fi network's SSID and password are correct and each Roku device is connected to your Verizon router successfully. Click the Home button. Proceed with the Streaming Channels button and link each Roku device to your Roku account. Open up https://www.roku.com/link and log into your Roku account and type in the code to link each device to your Roku account. You will need to keep clicking the continue button on your Roku account web page on your PC until it says it is done. Look at each Roku device and make sure it says that each Roku device is successfully linked to your Roku account.
Click the Home button. Click System -> Check for Updates and click the OK button. Each Roku device will check for new firmware and channels and it should download and install the new firmware and add the new channels very quickly within five minutes. You should be able to add channels to each Roku device in the future.
The key is that each Roku device needs to establish a 5 GHz Wi-Fi connection to your Verizon router.