Online piano lessons depend on a clear enough view and sound for the teacher to assess what is happening. The camera should show your relationship to the bench, keyboard, hands, forearms, and pedals. The audio should preserve enough contrast for the teacher to hear melody, accompaniment, bass, articulation, and changes in dynamics.
If you use a stage piano or software instruments, prepare the sounds and controls you need before the lesson. A saved performance, registration, patch, split, or controller setting can change the result even when your hands appear to do the same thing. Setup problems should be ruled out quickly, not allowed to take over the lesson. Persistent tuning, regulation, hardware, or repair concerns belong with a qualified technician.