@jillannjenkins1
Since this is your first post, we don't have any background beyond what you just posted. So, first, a few questions.
You mention that things are working on two TVs and not on two TVs. That indicates you have a total of four Roku devices, right? You aren't moving a single device from one TV to another? And all four Roku devices have the same model number? You actually checked each device via Settings > System > About?
I ask because there have been multiple model numbers called "Express" and the number you supplied was an Express, but it's not the current one. If you bought one Express, then later another Express, it could have a different model number, unless you verified otherwise. Each model number is a little different from the others on the inside. We just want to make sure all of your devices are the same model number.
This will be a series of questions and/or steps to perform to gather information. The follow-up questions or steps will be determined based on the answers and results. That is, under some circumstances, you'd do one action next, but under other circumstances, you'd do a different action next.
So, confirm the number of devices and the model numbers for each.
DBDukes
Roku Community Streaming Expert
Note: I am not a Roku employee.
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