What model Roku are you using? (Check your model and model number via Roku menu path Settings > System > About)
NBC says its NBC Peacock app for Roku was written by NBC to be compatible with the following Roku model :
Roku 2 (4210X model only)
Roku 3 & 4 (model 4200X or later)
Roku Streaming Stick (model 3600X or later)
Roku Express/Express+ (model 3900X or later)
Roku Premiere/Premiere+ (model 3920X or later)
Roku Ultra/Ultra LT (model 4640X or later)
Roku TV and Smart Soundbar (model 5000X or later)
Current as of October 19, 2022. Check the source listed below for updates.
(I think it's safe to assume that more recent models not yet listed by Peacock are supported)
From <https://www.peacocktv.com/help/article/what-devices-and-platforms-are-supported-by-peacock>
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