@catmaru-
Could the button you hit on the remote have been a button on the Roku remote app on a phone or tablet?
At the bottom of the app's home screen, hit Devices.
On the resulting screen, in the section for your Ultra, hit the three dots on the right.
One of the options there for an Ultra is Ping remote.
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