I did a system restart TWICE and STILL can't get the app to upload on my box for Disney +. It's also not showing the graphic for the channel, just a blank box. I went online and "added" it, but it still isn't showing up on my TV box.
On my Roku Ultra, I'm getting:
"We're currently experiencing slow internet connection speeds. Please check to see that you are still connected to the internet, and try again. (Error Code 76)"
Not a problem on my end. Netflix, Amazon Prime, and other channels on the same Ultra are instantly queueing up and streaming in HD just fine.
Looks like Disney might not have been prepared for the traffic of opening day.
UPDATE: Looks like it's widespread. Primarily the eastern US, but I'm guessing that's because the western US is just waking up, since it's only 6:35 a.m. out there as I type this.
I had the same issue. "Channel install failed. Could not add 'Disney Plus.'"
What model Roku device do you have, and what version of Roku OS is installed?