The other trick is to clamp the flexy hoses (not braided ones !) press the pedal (need's glamorous assistant )when pressurised release hoses one at a time and feel for the pedal dropping indicating air in the line.
If I remember correctly the one nearest to the pedal is rear brakes,put the bleed nipple in that and see what happens.
The pedal pushes the front cylinder into the other with fluid and is probably the cause of the problem as it's bypassing.
Best of luck.
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