I don't have the NHL app, so I can't test it.
In general, after removing a channel, best practice is to restart** your Roku to clear its memory cache BEFORE reinstalling the channel. Did you do this? Without the restart you may not get a clean reinstall.
Depending on your Roku model you'll find the "System restart" option under either "Settings > System > Power" or if you don't have that Power option, under "Settings > System". If you don't have sufficient control to use the menus, or if it is just more convenient, you can also restart by pulling the power plug for a short while, then plugging it back in.
**On a Roku TV with "Fast TV Start" enabled, turning the TV off/on only puts you in/out of a low power standby state, it does NOT give you a complete restart. Use the methods above.
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
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Ultra 4800 | Streaming Stick 4K+ 3821 | TCL Roku TV 43S245/C107X
