Hi giancarlo.sevilla2805, 

Kindly make sure your character is in T-Pose while retargeting in Maya, 
the exclamation mark will appear if your character is not in T-pose.

If the issue still persists, please sent me a screen recording of your process and your character FBX file,
thank you.

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[Update]
My Colleague, Sarah, had provided me with your avatar, 
we took the liberty and ran it through a quick test,
please refer to this video for further details.

Hello , I have been following the tutorial to retarget the actor core animations to my CC 3 model , unfortunately the the skeletons are not being retargeted as expected , I have been watching several tutorials but so far I cant determine what the problem is . so If anyone can help it will be really appreciated , thank you !!