I have 2 computers, and both have Android Studio (I installed it yesterday), but only one of them sees my phone. ADB devices also doesn't see it. The developer mode is enabled, SDK is installed, google usb driver is installed, enabling PTP didn't help.
What can I do?
Xiaomi Redmi 4X Windows 10
I assume that you are working on Windows. What had helped me once was to install Adb drivers from Intel website. You can follow this tutorial