Cannot change freehub

  I have got a tacx neo 3M. Previous user replaced original freehub  by a sram xdr compatible. I have removed gear wheel but no idea about removing freehub. No screws , bolts (all videos refer to a 5 Allen screw) but the space for the  axis, Tried pulling,  but hard a steel welded.. I do not want to damage anything due excessive force.

please   Any idea?  Chat GPt answers non sense things