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.
Simultaneous streams are those streams that are being streamed to multiple devices on your account from that streaming source. This could be multiple Rokus linked to your Roku account, or it could be friends/family/others you've shared your account with on sources like Netflix, Prime Video, Hulu, etc. Many subscription services limit the number of simultaneous streams you can have. For instance, my Netflix and Hulu accounts allow two, and Acorn says it only allows one. Some have higher priced tiers allowing a greater number of simultaneous streams.
Roku Streaming Stick +, 3810X, Ser YH0059427035, wifi - Samsung UN55ES6100
Roku Streaming Stick, 3600X, Ser 5S56D8240827, wifi - JVC EM37T
Specifically, which channels are giving this message?
Are there other devices (e.g., laptops, desktop, smart-phone) that are also capable of running these channels (Netflix, Hulu, Amazon Prime, etc.)?
If it is Netflix, Amazon Prime or Hulu, you can login to their web pages and verify your account settings. If they appear correct, I would suggest that you change the passwords on any paid subscription channels.
I could be that someone has hacked your account and is attempting to view these channels at the same time you are trying to.