Use a drain bladder to see if that will remove the obstruction.
Plunger the drain also.
If these all fail, I would use a electric drain cable down the overflow of tub drain and spin the cable in reverse to get it to start to go through the trap.
Once you pass past the trap, return the machine to forward direction and move the cable inwards to remove the obstruction.
“Your best interest is secured by making the right decisions the first time.”