@lmnight-
I'm seeing lots of channel updates lately, likely related to the rollout of Roku operating system 12.5. If the Tubi app did not install properly that could explain your problem.
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 number you'll find the "System restart" option under either "Settings > System > Power" or 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