Calibration fails with gimbal motor

Hi!
I want to drive a T-Motor GB54-2 using an ODrive Micro.
Specs of this motor:
12N14P, 26KV, 15 Ohm internal resistance.
So I set pole pairs to 7 and KV=26 in the web GUI. I can see that the onboard encoder is working correctly. Then I disconnect USB and connect power(12V-20V) and CAN and run the can_calibrate.py script.(I do this because I do not have a USB insulator)
Then the motor makes some noise and moves a bit. Then the LED flashes red.
The script displays these errors when I play with the calibration voltage and current values:
PHASE_RESISTANCE_OUT_OF_RANGE, PHASE_INDUCTANCE_OUT_OF_RANGE
The ODrive error description tells me that:

config.motor.resistance_calib_max_voltage > calibration_current * phase_resistance
So e.g. 6 > 0.3 * 15 when I power it with 12 V should be alright?

Is there any general problem with this motor or what am I doing wrong?
Any help appreciated!