"Allow USB debugging?" keeps popping up

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I'm going nuts here. I am trying to debug my app on a Samsung Galaxy Tab S5e.

My application runs a VPNService and I am reasonably sure this is the root cause of the following issue:

When debugging via USB, everything works fine. However, when I debug over WIFI, it keeps prompting me to "Allow USB debugging", saying something about the computers RSA key fingerprint and whether I want to "always allow from this computer", which I obviously select and then click "allow".

If I try debug my app again, it will again prompt me...

I've tried:

  • restarting the device.
  • killing adb and starting it again
  • restarting my machine (Macbook Pro)
  • revoking all USB debugging authorisations
  • deleting the adbkey.pub and adbkey files
  • FACTORY RESET OF DEVICE

Nothing works.

Does anyone know how I can solve this? I have to go via wireless because I need to measure energy consumption... which I cannot do if the device is being charged.

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