Never mind. I deleted my original response. I see that Roku has/had a problem with people being able to log in on the Android app. Hopefully it's fixed or will be fixed soon. As far as I've seen it only affects Android devices, so if you have an Apple device it should be ok or you can view a camera on your Roku device.
Roku Community Streaming Expert
Help others find this answer and click "Accept as Solution."
If you appreciate my answer, maybe give me a Kudo.
I am not a Roku employee.