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.
As mentioned throughout this thread, for more information about Sundance Now's account authentication and functionality, you'll want to contact the channel provider support directly to inquire further. Many channels on Roku are developed and maintained by the channel provider themselves.
Yea, I think the solution is to chuck BOTH Sundance Now and Roku. It seems that Sundance Now doesn't care once they have your money and Roku is not quite as big a player as it once was (e.g. HBO Max doesn't have a Roku app). No point in theorizing that "it's SN's fault", get something that works.
Good news - or at least progress. Sundance finally responded on my ticket and nudges a couple of days ago and we've been exchanging details of the issue. I have an email this morning saying they've identified the source of the issue and should have an update soon. I'll post more as I get it.