Animation issue in Sequencer

Trying to start using Sequencer and following a few tutorials and seem to have hit an issue.
When I use the SK_Mannequin and ThirdpersonIdle Animation in Sequencer all looks good but as soon as I try to use a different character and retargetted animations nothing works??
When I use the retargetted animations in Use Animation Blueprint mode and in game they work??

Any ideas what I have got wrong?
Ive attached a screenshot that will hopefully help