I own a Note 10+ and have used a screen miroring for mobile game play capture. Recently purchased an Elgato HD60 S+ capture card but when hooking up phone to capture card it gives a video output 4069x2160p30 error also saying change output resolution. Does not seem to be a video output resolution that can be changed manually. Is there a fix for this in missing or a piece of equipment I need?
Try lowering your resolution and see if that fixes the issue. If you're streaming through OBS usually there are hiccups with the software when the video output is higher. Not sure if you're streaming but streaming platforms compress video footage anyway so it's not necessary to stream at such a high resolution.