Replacement AirPod Pro (2nd generation)

I recently bought a replacement airpod for my AirPods Pro 2nd generation but now they won’t connect. I tried everything, hold the button, cleaned it, etc and it just won’t work. If I take my old AirPod out the replace airpod works & connected but not the other one. Once both of them are put in the box it just keeps flashing orange. I already tried fully removing them from my phone and connecting again and it just won’t work. This is really ******* me off. I been trying none stop for the past 3 days because I really need them.