A big thing here is to have IK off. To have body pose set to default T. To have hip and body set to zero. To have expression set to default. To have all body scaling morphs returned to default (head size, neck length, chest size, etc) These will get you a vertice error ..

When you export,  click on Universe (deselect all), then click on head.. Export options should either be none or just  "include existing groups in polygon groups". Save it somewhere. Close or,,,

Load a NEW figure or new file. Select NEW figure  Head... Go to Object > LOAD MORPH TARGET

Click on grey box and find your saved Head. Name it. Do not check "correct vertice order" click OK

Nothing happens! At the very bottom of the head parameter under MORPH,,, you will find your name. Set this to 1.00 or,,, less 0.500 for effects or blending heads...etc Save this figure to CR2 library..

This works for me on a simple head. *This still may not work on your pc