@NicholasStokes The 3500 is an older device (released March 2014, so approaching 9 years old), and many of the newer channels will not work on it. It is also being dropped to legacy status, meaning it will no longer receive Roku OS updates. Remotes are no longer available for it. Frankly, it's time to replace it.
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I have the same problem on new Roku TVs purchased last year. In addition, on 1 where I have been testing the guest mode, the guest mode deletes all apps/channels and you have to start from scratch which is a useless feature as you want to create a base case to use.
We understand that you are reaching out related to channels that are not showing on your Roku device that you added from the Roku channel store.
We always suggest checking if the Roku account email is the same as the account that is on the Roku device by going to Settings > System > About. What Roku model device are you using? Which streaming channels are you trying to add?
@ewsb You can't create a base of channels for guest mode. Guest mode pre-selects a set of channels and then the guest can add more channels from the channel store. When the guest mode time period expires all logins and channels added are deleted. Good information here https://support.roku.com/article/360015611254
Many thanks - as per your message that is exactly the issue. The Guest Mode is selecting NO channels and only presents a blank slate, not even a basic slate.
Separately as noted, the ability to create a base slate would be very valuable. Unfortunately without that, I will remove all the Roku TVs I have unfortunately as it makes the system impossible to use for guests. (ie they have to add every single channel they want including the basics such as Netflix)