On my main TV i have peacock added,but on another tv it isnt showing, even in the channel store. Roku Express model 3700
Peacock's programmers decided not to support the 3700 due to it's older CPU being underpowered and/or not supporting certain features.
For readers with Roku models other than the Express (3700):
The NBC Peacock app for Roku was written by NBC to be compatible with the following Roku models (Check your model number via Settings > System > About):
(Current as of October 27, 2020. Check the source listed below for updates.)
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)
Source: https://www.peacocktv.com/help/article/what-devices-and-platforms-are-supported-by-peacock