Pop-up message to allow USB debugging doesn’t appear on my phone

[EduTorre]

Hi, I have a Mi Mix 2s with MIUI Global 12.0.1 installed. I am trying to use a third party software (Dr Fone) to migrate my whatsapp messages to another phone. I have set up the USB debugging options (both USB debugging and allow install via USB) but when I connect via cable my phone to the computer the desktop software should launch a pop-up message on my computer to trust that device to allow the debugging which doesn’t appear. I have also tried different softwares that do the same thing but the result is always the same. I get stuck at when the pop up message should appear on my computer. Any idea on what might be the problem?