Phone not found

I tried building my game for Android but when finding the SDK the phone just can’t be found.
On the normal file explorer the phone files could be found. I tried unlocking the phone, pinning the phone to quick access but that didn’t work either(Just said “File not valid”).
I have a Vodafone VFD 600 with Android 6.0.1 on it. I changed the minimum to 5.1 and the maximum to 7.0 but that didn’t help.
Changed the maximum version and tried it on my dad’s phone also didn’t work
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The SDK has nothing to do with your actual phone, it’s available directly as a module when you install Unity. See https://docs.unity3d.com/Manual/android-sdksetup.html