Suddenly, the mobile app on neither my iPhone nor my iPad can find my Roku streaming stick+. OF COURSE both the roku and iPhone/iPad are on the same network. I've been using the mobile app every day, and DEPEND ON IT COMPLETELY to both navigate the device and get my audio. I have unplugged my router/modem, and rebooted the streaming stick as well. I have deleted and redownloaded the app. Again, the app on neither the iPad NOR iPhone is able to find the device, it is clearly a problem with ROKU and its mobile app. WTF?
The problem could be with the iOS Roku app, or it could be with the Roku itself. If your Roku SS+ has lost its connection to your network, the Roku app can't see it.
Assuming you don't have a physical Roku remote for your Streaming Stick+ that you can troubleshoot with, can you go into your router's control panel and determine whether it shows your SS+ is connected to your network?
Yes, naturally I made sure that both the iPhone and the SS+ are connecting to the network. So yes, the SS+ is connected to the network -- I used the regular remote to test this. However, as I mentioned in my post, I connect my audio using the mobile app, so I depend on the mobile app 100%
I had a similar issue with my iPad (iPadOS 16.2) that had started a couple of weeks ago (though my iPhone is still connected). I did everything recommended by Roku (ensured devices were on the same network, etc.), deleted & reinstalled the Roku app, and did a full reset on my Roku Ultra to no avail. I eventually solved it today by performing the nuclear option: a full and a complete restore of my iPad via iTunes. Though I wasn’t keen to do this, I did as that my last option. It took a few hours, and that solved it. I can now find my Roku devices on my iPad.