not getting length of for whole sequence

[sanfx]

Hello Mark,

I am not getting IN-OUT length on the Sequnce Track although each individual tracks do have the range. This is what I am trying to do in aaf.

    aaf_file = aaf.open(path, 'w')
    timeline_start, timeline_end = cut_data.get_timeline_range()
    duration = timeline_end - timeline_start # 333
    frame_rate = 24
    timecode = factory.create.Timecode(duration, 0, frame_rate)
    timecode_slot = composition_mob.append_new_timeline_slot(
        frame_rate,
        timecode
    )

    timecode_id = 1  
    timecode_slot.name = 'TC 1'
    timecode_slot.slotID = timecodeid
    timeline_mob_slot = aaf_file.create.TimelineMobSlot()
    timeline_mob_slot.slotID = timecodeid
    timeline_mob_slot.mark_in = 0
    timeline_mob_slot.mark_out = duration
    timeline_mob_slot["PhysicalTrackNumber"].value = 1
    aaf_file.save(path)

But still I do not get in and out on the Sequnce Track