Looks like this is a duplicate thread. But the original had large blank spaces, hard to read on a phone I imagine.
As Bobby-gg pointed out in the other thread, it looks like the battery and panel wires are crossed.
17V is more like a solar panel voltage, and 12.6V is a typical battery voltage. Since the input is lower than the output, the current (amps) is zero.
If you change the connections, make sure you connect the battery wires first, so that the MPPT can sense the battery and register that it's a 12V battery not a 24V one. Since you've had 17V on the battery input, it could easily have decided it's a 24V battery.