- What model Rokus do you have in your two rooms (model NAME and NUMBER)?
- Are both Rokus linked to the same Roku account, as indicated by email address?
You can find answers to both via Roku menu path Settings > System > About.
I can find no listing on Amazon re which Roku models Amazon has written their Prime Video Roku channel app to run on. However, a couple of years ago Amazon announced in emails to Roku owners that, effective November 1, 2021, their Prime Video would no longer support the following older Roku model numbers:
Roku 2 HD/XD/XS models 2050X, 2500X, 2720X, 3000X, 3050X, 3100X
Roku LT models 2400X, 2450X, 2700X
Roku SE model 2710X
Roku Streaming Stick models 3400X, 3420X, 3500X
(The Xs or other letters at the end of the model number are distribution codes and are irrelevant for this issue.)
I'm unaware of any similar announcement from Amazon since then, so I would assume all newer devices than the ones mentioned, including any of the Premiere models, will be compatible with Amazon Prime.
In general, if you go into the Streaming Store from your Roku device's home page, do a search for Prime Video and not find it, your Amazon does not support Prime on your Roku model.
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