Are both your Rokus linked to the same Roku account? Check on each via Settings/System/About. The email address shown identifies your account.
If on the same account, try this:
Go back into your Peacock account as before, and sign out of your account. Now sign back in and see if your subscription on that Roku updates.
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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Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X