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.
This is NOT true. I do know how to log in Disney plus on Roku and I did. But the Roku would ask me to subscribe again. That's the issue. The Roku still failed to solve this issue with this many complaints.
Why don't you go back to your software developer to figure out what the root cause is? Simply posting procedure here doesn't solve the problem.