I was finaly able to export the animated scene to sketchfab. With this upload I celebrate the support of custom normals, that was added today
https://help.sketchfab.com/hc/en-us/requests/73469?page=1
but the blend file olny contains the animation -> not the simulation.
for that please check out https://sketchfab.com/3d-models/lego-bricks-55446142c5d54d0e8350246d3c3e3423.